diff --git a/src/main/java/com/yunhai/homework/controller/api/StudentHomeworkController.java b/src/main/java/com/yunhai/homework/controller/api/StudentHomeworkController.java
index 56a37b0..66d42b1 100644
--- a/src/main/java/com/yunhai/homework/controller/api/StudentHomeworkController.java
+++ b/src/main/java/com/yunhai/homework/controller/api/StudentHomeworkController.java
@@ -25,7 +25,7 @@ import java.util.Map;
 /**
  * 课堂作业 V2 学生端接口（PRD §18 路径一字对齐：/student/homeworks…）。
  * <p>
- * 身份：当前登录用户ID ↔ class_student 名册；仅可见本人班级作业，禁 IDOR。
+ * 身份：当前登录用户ID ↔ bschclass 学生名册（实时匹配）；仅可见本人班级作业，禁 IDOR。
  */
 @RestController
 @RequestMapping(value = Config.API_PATH + "/student/homeworks")
diff --git a/src/main/java/com/yunhai/homework/controller/api/TeacherHomeworkV2Controller.java b/src/main/java/com/yunhai/homework/controller/api/TeacherHomeworkV2Controller.java
index 5335083..f949049 100644
--- a/src/main/java/com/yunhai/homework/controller/api/TeacherHomeworkV2Controller.java
+++ b/src/main/java/com/yunhai/homework/controller/api/TeacherHomeworkV2Controller.java
@@ -17,7 +17,6 @@ import com.yunhai.homework.model.v2.SubmissionVersionVo;
 import com.yunhai.homework.model.v2.SubjectDto;
 import com.yunhai.homework.model.v2.TeacherHomeworkQuery;
 import com.yunhai.homework.model.v2.TeachingClassVo;
-import com.yunhai.homework.service.impl.ClassStudentService;
 import com.yunhai.homework.service.impl.TeacherHomeworkV2Service;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.data.domain.Sort;
@@ -51,9 +50,6 @@ public class TeacherHomeworkV2Controller {
     @Autowired
     private TeacherHomeworkV2Service teacherHomeworkV2Service;
 
-    @Autowired
-    private ClassStudentService classStudentService;
-
     // ============================ 页 1：发布作业 ============================
 
     /** 创建作业（落草稿） */
@@ -198,22 +194,15 @@ public class TeacherHomeworkV2Controller {
 
     /** 按学科筛选我的任教班级（subId=学科编码；班级名称取学校班级列表） */
     @GetMapping("/subjects/classes")
-    public List<TeachingClassVo> teachingClasses(@RequestParam("subId") String subId) {
-        return teacherHomeworkV2Service.teachingClasses(subId);
+    public List<TeachingClassVo> teachingClasses(@RequestParam("subject") String subject) {
+        return teacherHomeworkV2Service.teachingClasses(subject);
     }
 
     // ============================ 辅助：班级树 / 名册同步 ============================
 
-    /** 年级→班级树（发布选班；名册快照聚合） */
+    /** 年级→班级树（发布选班；subId 传学科编码时仅返回该学科任教班级） */
     @GetMapping("/classes")
-    public List<ClassTreeNode> classTree() {
-        return teacherHomeworkV2Service.classTree();
-    }
-
-    /** 手动触发名册同步（bschclass 接口就绪前为空操作） */
-    @PostMapping("/classes/sync")
-    public Map<String, Integer> syncClasses() {
-        int synced = classStudentService.syncAll();
-        return java.util.Collections.singletonMap("synced", synced);
+    public List<ClassTreeNode> classTree(@RequestParam(value = "subject", required = false) String subject) {
+        return teacherHomeworkV2Service.classTree(subject);
     }
 }
diff --git a/src/main/java/com/yunhai/homework/entity/ClassStudent.java b/src/main/java/com/yunhai/homework/entity/ClassStudent.java
deleted file mode 100644
index 793e295..0000000
--- a/src/main/java/com/yunhai/homework/entity/ClassStudent.java
+++ /dev/null
@@ -1,59 +0,0 @@
-package com.yunhai.homework.entity;
-
-import lombok.Data;
-import lombok.EqualsAndHashCode;
-import lombok.NoArgsConstructor;
-
-import javax.persistence.Column;
-import javax.persistence.Entity;
-import javax.persistence.Table;
-import javax.persistence.UniqueConstraint;
-import java.time.LocalDateTime;
-
-/**
- * 班级学生名册快照（PRD class_student）。
- * <p>
- * 由同步任务从 bschclass 拉取（接口未就绪前用种子数据），每日全量刷 + 手动触发；
- * 同步不物理删，转出置 status=0。学生身份口径：用户中心数字ID（UserContext.getUserId()）
- * ↔ student_id（SchStudent.UserStuSerID），名册仅存学生ID + 姓名快照。
- */
-@NoArgsConstructor
-@Data
-@Entity
-@Table(name = "class_student",
-        uniqueConstraints = @UniqueConstraint(name = "uk_class_student", columnNames = {"class_id", "student_id"}))
-@EqualsAndHashCode(onlyExplicitlyIncluded = true, callSuper = false)
-public class ClassStudent extends BaseEntity {
-
-    /** 学校ID */
-    @Column(name = "school_id", nullable = false)
-    private Integer schoolId;
-
-    /** 班级ID */
-    @Column(name = "class_id", nullable = false, length = 64)
-    private String classId;
-
-    /** 班级名快照 */
-    @Column(name = "class_name", length = 50)
-    private String className;
-
-    /** 年级名快照 */
-    @Column(name = "grade_name", length = 50)
-    private String gradeName;
-
-    /** 学生ID（用户中心数字ID，即 SchStudent.UserStuSerID） */
-    @Column(name = "student_id", nullable = false)
-    private Integer studentId;
-
-    /** 学生姓名 */
-    @Column(name = "student_name", nullable = false, length = 50)
-    private String studentName;
-
-    /** 在班状态：1 在班 / 0 已转出退课 */
-    @Column(name = "status", nullable = false)
-    private Integer status = 1;
-
-    /** 离班时间 */
-    @Column(name = "leave_at")
-    private LocalDateTime leaveAt;
-}
diff --git a/src/main/java/com/yunhai/homework/entity/HomeworkClass.java b/src/main/java/com/yunhai/homework/entity/HomeworkClass.java
index c01cefb..857f91a 100644
--- a/src/main/java/com/yunhai/homework/entity/HomeworkClass.java
+++ b/src/main/java/com/yunhai/homework/entity/HomeworkClass.java
@@ -26,8 +26,8 @@ public class HomeworkClass extends BaseEntity {
     private Integer homeworkId;
 
     /** 班级ID */
-    @Column(name = "class_id", nullable = false, length = 64)
-    private String classId;
+    @Column(name = "class_id", nullable = false)
+    private Integer classId;
 
     /** 班级名快照 */
     @Column(name = "class_name", length = 50)
diff --git a/src/main/java/com/yunhai/homework/entity/HomeworkReadRecord.java b/src/main/java/com/yunhai/homework/entity/HomeworkReadRecord.java
index 8179e79..3843c1b 100644
--- a/src/main/java/com/yunhai/homework/entity/HomeworkReadRecord.java
+++ b/src/main/java/com/yunhai/homework/entity/HomeworkReadRecord.java
@@ -37,8 +37,8 @@ public class HomeworkReadRecord extends BaseEntity {
     private String studentName;
 
     /** 班级ID */
-    @Column(name = "class_id", length = 64)
-    private String classId;
+    @Column(name = "class_id")
+    private Integer classId;
 
     /** 阅读状态：0 UNREAD / 1 READ */
     @Column(name = "is_read", nullable = false)
diff --git a/src/main/java/com/yunhai/homework/entity/HomeworkSubmission.java b/src/main/java/com/yunhai/homework/entity/HomeworkSubmission.java
index 4626044..cfd95bb 100644
--- a/src/main/java/com/yunhai/homework/entity/HomeworkSubmission.java
+++ b/src/main/java/com/yunhai/homework/entity/HomeworkSubmission.java
@@ -41,8 +41,8 @@ public class HomeworkSubmission extends BaseEntity {
     private String studentName;
 
     /** 班级ID */
-    @Column(name = "class_id", nullable = false, length = 64)
-    private String classId;
+    @Column(name = "class_id", nullable = false)
+    private Integer classId;
 
     /** 班级名快照 */
     @Column(name = "class_name", nullable = false, length = 50)
diff --git a/src/main/java/com/yunhai/homework/entity/SchClassTeach.java b/src/main/java/com/yunhai/homework/entity/SchClassTeach.java
deleted file mode 100644
index d1a091f..0000000
--- a/src/main/java/com/yunhai/homework/entity/SchClassTeach.java
+++ /dev/null
@@ -1,46 +0,0 @@
-package com.yunhai.homework.entity;
-
-import lombok.Data;
-import lombok.EqualsAndHashCode;
-import lombok.NoArgsConstructor;
-
-import javax.persistence.Column;
-import javax.persistence.Entity;
-import javax.persistence.Table;
-import javax.persistence.UniqueConstraint;
-
-/**
- * 班级任教关系快照（bschclass sch_class_teach 本地镜像，PRD 口径同 class_student）。
- * <p>
- * 由同步任务从 bschclass 拉取（接口未就绪前用种子数据）；bschclass 任教接口
- * 不可用时，任教学科链路降级读本表。教师口径：用户中心数字ID（UserContext.getUserId()）；
- * class_id 与 class_student.class_id 同一取值域。
- */
-@NoArgsConstructor
-@Data
-@Entity
-@Table(name = "sch_class_teach",
-        uniqueConstraints = @UniqueConstraint(name = "uk_sch_class_teach", columnNames = {"school_id", "class_id", "tea_id", "sub_id"}))
-@EqualsAndHashCode(onlyExplicitlyIncluded = true, callSuper = false)
-public class SchClassTeach extends BaseEntity {
-
-    /** 学校ID */
-    @Column(name = "school_id", nullable = false)
-    private Integer schoolId;
-
-    /** 班级ID（与 class_student.class_id 同一取值域） */
-    @Column(name = "class_id", nullable = false, length = 64)
-    private String classId;
-
-    /** 教师ID（用户中心数字ID） */
-    @Column(name = "tea_id", nullable = false)
-    private Integer teaId;
-
-    /** 学科编码（bschclass SubID；本地无字典时编码即展示名） */
-    @Column(name = "sub_id", nullable = false, length = 64)
-    private String subId;
-
-    /** 有效状态：1 有效 / 0 失效 */
-    @Column(name = "status", nullable = false)
-    private Integer status = 1;
-}
diff --git a/src/main/java/com/yunhai/homework/job/HomeworkScheduledJobs.java b/src/main/java/com/yunhai/homework/job/HomeworkScheduledJobs.java
index 5377254..cdb013c 100644
--- a/src/main/java/com/yunhai/homework/job/HomeworkScheduledJobs.java
+++ b/src/main/java/com/yunhai/homework/job/HomeworkScheduledJobs.java
@@ -3,9 +3,7 @@ package com.yunhai.homework.job;
 import com.yunhai.homework.entity.Homework;
 import com.yunhai.homework.enums.HwStatusEnum;
 import com.yunhai.homework.enums.NotificationTypeEnum;
-import com.yunhai.homework.repository.HomeworkClassRepository;
 import com.yunhai.homework.repository.HomeworkRepository;
-import com.yunhai.homework.service.impl.ClassStudentService;
 import com.yunhai.homework.service.impl.HomeworkStateService;
 import com.yunhai.homework.service.impl.NotificationService;
 import com.yunhai.homework.service.impl.TeacherHomeworkV2Service;
@@ -33,9 +31,6 @@ public class HomeworkScheduledJobs {
     @Autowired
     private HomeworkRepository homeworkRepository;
 
-    @Autowired
-    private HomeworkClassRepository homeworkClassRepository;
-
     @Autowired
     private HomeworkStateService stateService;
 
@@ -45,9 +40,6 @@ public class HomeworkScheduledJobs {
     @Autowired
     private TeacherHomeworkV2Service teacherHomeworkV2Service;
 
-    @Autowired
-    private ClassStudentService classStudentService;
-
     /**
      * 定时发布：每分钟扫描到点的 DRAFT_SCHEDULED 作业 → PUBLISHED + 作业发布通知；
      * 失败回退 DRAFT_UNPUBLISHED 并站内通知教师。
@@ -146,16 +138,4 @@ public class HomeworkScheduledJobs {
                 NotificationService.deadlineReminderContent(homework) + "（剩余不足 " + slotDesc + "）");
         log.info("[deadlineReminder] homeworkId={}, slot={}, sent={}", homework.getId(), slot, sent);
     }
-
-    /**
-     * 名册同步：每日 02:00 全量刷新 class_student（bschclass 接口就绪前仅日志）。
-     */
-    @Scheduled(cron = "${homework.sync.class-data-cron:0 0 2 * * ?}")
-    public void classDataSync() {
-        try {
-            classStudentService.syncAll();
-        } catch (Exception e) {
-            log.error("[classDataSync] 名册同步失败", e);
-        }
-    }
 }
diff --git a/src/main/java/com/yunhai/homework/model/v2/ClassItem.java b/src/main/java/com/yunhai/homework/model/v2/ClassItem.java
index 459ea80..da3c3a0 100644
--- a/src/main/java/com/yunhai/homework/model/v2/ClassItem.java
+++ b/src/main/java/com/yunhai/homework/model/v2/ClassItem.java
@@ -12,7 +12,7 @@ import lombok.NoArgsConstructor;
 @AllArgsConstructor
 public class ClassItem {
 
-    private String classId;
+    private Integer classId;
 
     private String className;
 }
diff --git a/src/main/java/com/yunhai/homework/model/v2/ClassTreeNode.java b/src/main/java/com/yunhai/homework/model/v2/ClassTreeNode.java
index c0f400b..4ea7896 100644
--- a/src/main/java/com/yunhai/homework/model/v2/ClassTreeNode.java
+++ b/src/main/java/com/yunhai/homework/model/v2/ClassTreeNode.java
@@ -7,12 +7,12 @@ import java.util.List;
 
 /**
  * 年级→班级树（发布作业选班 + 应交名单基数来源）。
- * 叶子节点 id = 班级 id（class_student 快照聚合）。
+ * 叶子节点 id = 班级 id（bschclass 班级/年级实时组装）。
  */
 @Data
 public class ClassTreeNode {
 
-    /** 年级节点为 gradeName，班级叶子为 classId */
+    /** 年级节点为年级ID（无年级归属时为「未分组」文案），班级叶子为 classId */
     private String id;
 
     /** 展示名 */
diff --git a/src/main/java/com/yunhai/homework/model/v2/HomeworkStatsVo.java b/src/main/java/com/yunhai/homework/model/v2/HomeworkStatsVo.java
index 1ac46f8..1cf2c88 100644
--- a/src/main/java/com/yunhai/homework/model/v2/HomeworkStatsVo.java
+++ b/src/main/java/com/yunhai/homework/model/v2/HomeworkStatsVo.java
@@ -27,7 +27,7 @@ public class HomeworkStatsVo {
     @Data
     public static class ByClass {
 
-        private String classId;
+        private Integer classId;
 
         private String className;
 
diff --git a/src/main/java/com/yunhai/homework/model/v2/HomeworkV2Request.java b/src/main/java/com/yunhai/homework/model/v2/HomeworkV2Request.java
index 9464910..671ebd7 100644
--- a/src/main/java/com/yunhai/homework/model/v2/HomeworkV2Request.java
+++ b/src/main/java/com/yunhai/homework/model/v2/HomeworkV2Request.java
@@ -26,7 +26,7 @@ public class HomeworkV2Request {
     private String description;
 
     /** 参与班级 id 列表 */
-    private List<String> classIds;
+    private List<Integer> classIds;
 
     /** 附件列表 */
     private List<AttachmentItem> attachments;
diff --git a/src/main/java/com/yunhai/homework/model/v2/StudentMatrixQuery.java b/src/main/java/com/yunhai/homework/model/v2/StudentMatrixQuery.java
index 49e3144..fcb531a 100644
--- a/src/main/java/com/yunhai/homework/model/v2/StudentMatrixQuery.java
+++ b/src/main/java/com/yunhai/homework/model/v2/StudentMatrixQuery.java
@@ -12,7 +12,7 @@ import lombok.EqualsAndHashCode;
 public class StudentMatrixQuery extends BasePageQuery {
 
     /** 班级筛选（空 = 全部参与班级） */
-    private String classId;
+    private Integer classId;
 
     /** 提交状态筛选：NOT_SUBMITTED/SUBMITTED/LATE_SUBMITTED/RETURNED/REVIEWED */
     private String submitStatus;
diff --git a/src/main/java/com/yunhai/homework/model/v2/StudentMatrixVo.java b/src/main/java/com/yunhai/homework/model/v2/StudentMatrixVo.java
index 6257285..b80bb2c 100644
--- a/src/main/java/com/yunhai/homework/model/v2/StudentMatrixVo.java
+++ b/src/main/java/com/yunhai/homework/model/v2/StudentMatrixVo.java
@@ -21,7 +21,7 @@ public class StudentMatrixVo {
     /** 姓名 */
     private String studentName;
 
-    private String classId;
+    private Integer classId;
 
     private String className;
 
diff --git a/src/main/java/com/yunhai/homework/model/v2/TeachingClassVo.java b/src/main/java/com/yunhai/homework/model/v2/TeachingClassVo.java
index d9fd64e..b675060 100644
--- a/src/main/java/com/yunhai/homework/model/v2/TeachingClassVo.java
+++ b/src/main/java/com/yunhai/homework/model/v2/TeachingClassVo.java
@@ -9,7 +9,7 @@ import lombok.Data;
 public class TeachingClassVo {
 
     /** 班级业务ID（bschclass sch_class.class_id） */
-    private String classId;
+    private Integer classId;
 
     /** 班级名称（学校班级列表映射；缺失时回退为班级ID） */
     private String className;
diff --git a/src/main/java/com/yunhai/homework/repository/ClassStudentRepository.java b/src/main/java/com/yunhai/homework/repository/ClassStudentRepository.java
deleted file mode 100644
index 0581e29..0000000
--- a/src/main/java/com/yunhai/homework/repository/ClassStudentRepository.java
+++ /dev/null
@@ -1,31 +0,0 @@
-package com.yunhai.homework.repository;
-
-import com.yunhai.homework.entity.ClassStudent;
-import org.springframework.data.jpa.repository.JpaRepository;
-import org.springframework.data.jpa.repository.Query;
-import org.springframework.data.repository.query.Param;
-
-import java.util.List;
-
-/**
- * 班级学生名册仓储。
- */
-public interface ClassStudentRepository extends JpaRepository<ClassStudent, Integer> {
-
-    /** 按学生ID（用户中心数字ID）反查学生身份（学生端接口入口） */
-    List<ClassStudent> findByStudentIdAndStatus(Integer studentId, Integer status);
-
-    /** 班级在班学生 */
-    List<ClassStudent> findByClassIdAndStatus(String classId, Integer status);
-
-    /** 指定班级集合的全部在班学生（应交名单） */
-    List<ClassStudent> findByClassIdInAndStatus(List<String> classIds, Integer status);
-
-    /** 指定学校的全部名册（同步任务全量刷新用） */
-    List<ClassStudent> findBySchoolId(Integer schoolId);
-
-    /** 年级→班级树：按学校去重班级（class_student 快照聚合），列序：classId, className, gradeName */
-    @Query("select distinct c.classId, c.className, c.gradeName from ClassStudent c " +
-            "where c.schoolId = :schoolId and c.status = 1")
-    List<Object[]> findDistinctClasses(@Param("schoolId") Integer schoolId);
-}
diff --git a/src/main/java/com/yunhai/homework/repository/HomeworkClassRepository.java b/src/main/java/com/yunhai/homework/repository/HomeworkClassRepository.java
index 8f651f5..80f3835 100644
--- a/src/main/java/com/yunhai/homework/repository/HomeworkClassRepository.java
+++ b/src/main/java/com/yunhai/homework/repository/HomeworkClassRepository.java
@@ -18,7 +18,7 @@ public interface HomeworkClassRepository extends JpaRepository<HomeworkClass, In
 
     /** 指定班级的全部作业ID（学生端列表倒查用） */
     @Query("select c.homeworkId from HomeworkClass c where c.classId in :classIds")
-    List<Integer> findHomeworkIdsByClassIds(@Param("classIds") List<String> classIds);
+    List<Integer> findHomeworkIdsByClassIds(@Param("classIds") List<Integer> classIds);
 
     /** 批量查 N 个作业的班级关联（列表展示避免 N+1） */
     @Query("select c from HomeworkClass c where c.homeworkId in :homeworkIds")
diff --git a/src/main/java/com/yunhai/homework/repository/SchClassTeachRepository.java b/src/main/java/com/yunhai/homework/repository/SchClassTeachRepository.java
deleted file mode 100644
index 8e60f47..0000000
--- a/src/main/java/com/yunhai/homework/repository/SchClassTeachRepository.java
+++ /dev/null
@@ -1,22 +0,0 @@
-package com.yunhai.homework.repository;
-
-import com.yunhai.homework.entity.SchClassTeach;
-import org.springframework.data.jpa.repository.JpaRepository;
-import org.springframework.data.jpa.repository.Query;
-import org.springframework.data.repository.query.Param;
-
-import java.util.List;
-
-/**
- * 班级任教关系快照仓储。
- */
-public interface SchClassTeachRepository extends JpaRepository<SchClassTeach, Integer> {
-
-    /** 指定学校指定教师的全部有效任教记录 */
-    List<SchClassTeach> findBySchoolIdAndTeaIdAndStatus(Integer schoolId, Integer teaId, Integer status);
-
-    /** 指定学校指定教师去重学科编码（字典序由调用方保证） */
-    @Query("select distinct t.subId from SchClassTeach t " +
-            "where t.schoolId = :schoolId and t.teaId = :teaId and t.status = 1")
-    List<String> findDistinctSubIds(@Param("schoolId") Integer schoolId, @Param("teaId") Integer teaId);
-}
diff --git a/src/main/java/com/yunhai/homework/service/impl/ClassStudentService.java b/src/main/java/com/yunhai/homework/service/impl/ClassStudentService.java
deleted file mode 100644
index 0785269..0000000
--- a/src/main/java/com/yunhai/homework/service/impl/ClassStudentService.java
+++ /dev/null
@@ -1,81 +0,0 @@
-package com.yunhai.homework.service.impl;
-
-import com.yunhai.homework.entity.ClassStudent;
-import com.yunhai.homework.repository.ClassStudentRepository;
-import com.yunhai.homework.utils.UserContext;
-import com.yunhai.platform.apistd.BizException;
-import com.yunhai.platform.utils.exception.ErrorCode;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.stereotype.Service;
-import org.springframework.transaction.annotation.Transactional;
-
-import java.util.List;
-import java.util.stream.Collectors;
-
-/**
- * 班级学生名册服务：学生端身份映射 + 名册同步任务入口。
- * <p>
- * 身份口径：当前登录人用户中心数字ID（UserContext.getUserId()，即 SchStudent.UserStuSerID）
- * ↔ class_student.student_id（status=1 在班）。名册不再存登录账号。
- * bschclass 名册开放接口未就绪期间（计划 §13-1），联调用种子数据
- * （sql/v3_seed.sql）填充本表；syncAll() 预留同步实现位。
- */
-@Service
-public class ClassStudentService {
-
-    private static final Logger log = LoggerFactory.getLogger(ClassStudentService.class);
-
-    @Autowired
-    private ClassStudentRepository classStudentRepository;
-
-    /**
-     * 当前登录用户ID对应的学生名册行（在班）。
-     *
-     * @throws BizException 未登录或用户ID未匹配名册
-     */
-    public List<ClassStudent> resolveMe() {
-        Integer userId = UserContext.getUserId();
-        if (userId == null) {
-            throw new BizException(ErrorCode.FORBIDDEN, "未获取到登录身份");
-        }
-        List<ClassStudent> me = classStudentRepository.findByStudentIdAndStatus(userId, 1);
-        if (me.isEmpty()) {
-            throw new BizException(ErrorCode.FORBIDDEN, "当前用户未匹配到学生名册，请联系管理员确认班级名册");
-        }
-        return me;
-    }
-
-    /**
-     * 学生 id（多班级重复时取第一个；学籍号一人一号，正常唯一）。
-     */
-    public Integer resolveMyStudentId() {
-        return resolveMe().get(0).getStudentId();
-    }
-
-    /**
-     * 我所在的班级 id 集合。
-     */
-    public List<String> resolveMyClassIds() {
-        return resolveMe().stream().map(ClassStudent::getClassId).distinct().collect(Collectors.toList());
-    }
-
-    /**
-     * 名册全量同步（每日 Job / 手动触发）。
-     * TODO bschclass「按学校查年级班级树+学生名册」开放接口就绪后接入
-     * （参照 ClassService.getSchTeaList 的直连模式）；未就绪时仅记录日志跳过。
-     */
-    @Transactional
-    public int syncAll() {
-        log.warn("[syncAll] bschclass 名册开放接口未就绪，本轮跳过（联调请执行 sql/v3_seed.sql 种子数据）");
-        return 0;
-    }
-
-    /**
-     * 班级在班学生（运维排查/种子校验用）。
-     */
-    public List<ClassStudent> findByClassId(String classId) {
-        return classStudentRepository.findByClassIdAndStatus(classId, 1);
-    }
-}
diff --git a/src/main/java/com/yunhai/homework/service/impl/HomeworkProgressCalculator.java b/src/main/java/com/yunhai/homework/service/impl/HomeworkProgressCalculator.java
index 2e66e31..eac4203 100644
--- a/src/main/java/com/yunhai/homework/service/impl/HomeworkProgressCalculator.java
+++ b/src/main/java/com/yunhai/homework/service/impl/HomeworkProgressCalculator.java
@@ -1,19 +1,15 @@
 package com.yunhai.homework.service.impl;
 
-import com.yunhai.homework.entity.ClassStudent;
 import com.yunhai.homework.entity.HomeworkReadRecord;
 import com.yunhai.homework.entity.HomeworkSubmission;
 import com.yunhai.homework.enums.SubmitStatusEnum;
 import com.yunhai.homework.model.v2.ProgressVo;
-import com.yunhai.homework.repository.ClassStudentRepository;
 import com.yunhai.homework.repository.HomeworkReadRecordRepository;
 import com.yunhai.homework.repository.HomeworkSubmissionRepository;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
-import org.springframework.util.StringUtils;
 
 import java.util.ArrayList;
-import java.util.Comparator;
 import java.util.HashSet;
 import java.util.LinkedHashMap;
 import java.util.List;
@@ -27,40 +23,31 @@ import java.util.stream.Collectors;
  * 单作业量级 ≤ 数百人，全部实时聚合不落冗余字段：
  * should = 参与班级在班学生去重数；submitted = 当前版本 status ∈ 已交集合；
  * graded = REVIEWED；unreadUndone = should −（已读 ∪ 已交）。
+ * 名册实时取 bschclass（{@link RosterService}，GetClaArrStulist），无本地快照。
  */
 @Service
 public class HomeworkProgressCalculator {
 
-    /**
-     * 名册条目（去重前）：矩阵与提醒名单需要 班级×学生 维度。
-     */
-    public static class RosterEntry {
-        public Integer studentId;
-        public String studentName;
-        public String classId;
-        public String className;
-    }
-
     /**
      * 聚合结果：总进度 + 分班进度 + 全量名册（班级×学生）。
      */
     public static class Result {
         public ProgressVo total;
         public List<ClassProgress> byClass = new ArrayList<>();
-        public List<RosterEntry> roster = new ArrayList<>();
+        public List<RosterService.RosterEntry> roster = new ArrayList<>();
     }
 
     /**
      * 分班进度条目。
      */
     public static class ClassProgress {
-        public String classId;
+        public Integer classId;
         public String className;
         public ProgressVo progress;
     }
 
     @Autowired
-    private ClassStudentRepository classStudentRepository;
+    private RosterService rosterService;
 
     @Autowired
     private HomeworkReadRecordRepository readRecordRepository;
@@ -73,25 +60,18 @@ public class HomeworkProgressCalculator {
      *
      * @param classIds 参与班级 id（homework_class 解析结果）
      */
-    public Result compute(Integer homeworkId, List<String> classIds) {
+    public Result compute(Integer homeworkId, List<Integer> classIds) {
         Result result = new Result();
 
-        // 1. 名册：班级×学生（应交基数）
-        List<ClassStudent> roster = classIds == null || classIds.isEmpty()
-                ? new ArrayList<>()
-                : classStudentRepository.findByClassIdInAndStatus(classIds, 1);
+        // 1. 名册：班级×学生（应交基数，实时 bschclass）
+        List<RosterService.RosterEntry> roster = rosterService.roster(classIds);
         Set<Integer> distinctStudents = new HashSet<>();
-        for (ClassStudent cs : roster) {
-            RosterEntry entry = new RosterEntry();
-            entry.studentId = cs.getStudentId();
-            entry.studentName = cs.getStudentName();
-            entry.classId = cs.getClassId();
-            entry.className = cs.getClassName();
-            result.roster.add(entry);
-            distinctStudents.add(cs.getStudentId());
+        for (RosterService.RosterEntry cs : roster) {
+            result.roster.add(cs);
+            distinctStudents.add(cs.studentId);
         }
-        result.roster.sort(Comparator
-                .comparing((RosterEntry e) -> nullSafe(e.className))
+        result.roster.sort(java.util.Comparator
+                .comparing((RosterService.RosterEntry e) -> nullSafe(e.className))
                 .thenComparing(e -> nullSafe(e.studentName)));
 
         // 2. 已读集合
@@ -109,9 +89,9 @@ public class HomeworkProgressCalculator {
         result.total = aggregate(distinctStudents, readSet, latest);
 
         // 5. 分班进度（班级维度不去重，矩阵口径）
-        Map<String, List<RosterEntry>> byClassEntries = result.roster.stream()
-                .collect(Collectors.groupingBy(e -> nullSafe(e.classId), LinkedHashMap::new, Collectors.toList()));
-        for (Map.Entry<String, List<RosterEntry>> e : byClassEntries.entrySet()) {
+        Map<Integer, List<RosterService.RosterEntry>> byClassEntries = result.roster.stream()
+                .collect(Collectors.groupingBy(e -> e.classId, LinkedHashMap::new, Collectors.toList()));
+        for (Map.Entry<Integer, List<RosterService.RosterEntry>> e : byClassEntries.entrySet()) {
             Set<Integer> classStudentIds = e.getValue().stream().map(r -> r.studentId).collect(Collectors.toSet());
             ClassProgress cp = new ClassProgress();
             cp.classId = e.getKey();
diff --git a/src/main/java/com/yunhai/homework/service/impl/HomeworkService.java b/src/main/java/com/yunhai/homework/service/impl/HomeworkService.java
index 669dd8b..a828e0d 100644
--- a/src/main/java/com/yunhai/homework/service/impl/HomeworkService.java
+++ b/src/main/java/com/yunhai/homework/service/impl/HomeworkService.java
@@ -354,14 +354,14 @@ public class HomeworkService implements IHomeworkService {
         if (collectableIds.isEmpty()) {
             return;
         }
-        Map<Integer, List<String>> classMap = homeworkClassRepository.findByHomeworkIds(collectableIds).stream()
+        Map<Integer, List<Integer>> classMap = homeworkClassRepository.findByHomeworkIds(collectableIds).stream()
                 .collect(Collectors.groupingBy(c -> c.getHomeworkId(),
                         Collectors.mapping(c -> c.getClassId(), Collectors.toList())));
         for (HomeworkVo vo : content) {
             if (!collectableIds.contains(vo.getId())) {
                 continue;
             }
-            List<String> classIds = classMap.getOrDefault(vo.getId(), Collections.emptyList());
+            List<Integer> classIds = classMap.getOrDefault(vo.getId(), Collections.emptyList());
             ProgressVo progress = homeworkProgressCalculator.compute(vo.getId(), classIds).total;
             vo.setProgress(progress);
         }
@@ -776,7 +776,7 @@ public class HomeworkService implements IHomeworkService {
         }
 
         List<Integer> hwIds = collected.stream().map(Homework::getId).collect(Collectors.toList());
-        Map<Integer, List<String>> classMap = homeworkClassRepository.findByHomeworkIds(hwIds).stream()
+        Map<Integer, List<Integer>> classMap = homeworkClassRepository.findByHomeworkIds(hwIds).stream()
                 .collect(Collectors.groupingBy(HomeworkClass::getHomeworkId,
                         Collectors.mapping(HomeworkClass::getClassId, Collectors.toList())));
 
@@ -787,7 +787,7 @@ public class HomeworkService implements IHomeworkService {
         long excellent = 0, good = 0, pass = 0, fail = 0;
 
         for (Homework h : collected) {
-            List<String> classIds = classMap.getOrDefault(h.getId(), Collections.emptyList());
+            List<Integer> classIds = classMap.getOrDefault(h.getId(), Collections.emptyList());
             ProgressVo p = homeworkProgressCalculator.compute(h.getId(), classIds).total;
 
             HomeworkStatisticsVo.HomeworkStat d = new HomeworkStatisticsVo.HomeworkStat();
@@ -898,8 +898,7 @@ public class HomeworkService implements IHomeworkService {
             return names;
         }
         return classes.stream()
-                .map(HomeworkClass::getClassId)
-                .filter(StringUtils::hasText)
+                .map(c -> String.valueOf(c.getClassId()))
                 .collect(Collectors.joining("、"));
     }
 
diff --git a/src/main/java/com/yunhai/homework/service/impl/StudentHomeworkService.java b/src/main/java/com/yunhai/homework/service/impl/StudentHomeworkService.java
index 7cf7753..14f67bf 100644
--- a/src/main/java/com/yunhai/homework/service/impl/StudentHomeworkService.java
+++ b/src/main/java/com/yunhai/homework/service/impl/StudentHomeworkService.java
@@ -1,6 +1,5 @@
 package com.yunhai.homework.service.impl;
 
-import com.yunhai.homework.entity.ClassStudent;
 import com.yunhai.homework.entity.Homework;
 import com.yunhai.homework.entity.HomeworkAttachment;
 import com.yunhai.homework.entity.HomeworkClass;
@@ -19,7 +18,6 @@ import com.yunhai.homework.model.v2.StudentResultVo;
 import com.yunhai.homework.model.v2.StudentSubmitRequest;
 import com.yunhai.homework.model.v2.SubmissionActionRequest;
 import com.yunhai.homework.model.v2.SubmissionVersionVo;
-import com.yunhai.homework.repository.ClassStudentRepository;
 import com.yunhai.homework.repository.HomeworkAttachmentRepository;
 import com.yunhai.homework.repository.HomeworkClassRepository;
 import com.yunhai.homework.repository.HomeworkReadRecordRepository;
@@ -46,8 +44,8 @@ import java.util.stream.Collectors;
 /**
  * 课堂作业 V2 学生端业务（PRD §18 学生页 1~3）。
  * <p>
- * 身份：登录平台用户ID ↔ class_student.student_id 名册（ClassStudentService）；仅可见本人班级作业。
- * 提交多版本：提交/打回重交/撤回均新增行（version+1、is_latest 翻转），历史保留。
+ * 身份：登录平台用户ID ↔ bschclass 学生名册（{@link RosterService} 实时匹配，无本地快照）；
+ * 仅可见本人班级作业。提交多版本：提交/打回重交/撤回均新增行（version+1、is_latest 翻转），历史保留。
  */
 @Service
 public class StudentHomeworkService {
@@ -71,10 +69,7 @@ public class StudentHomeworkService {
     private SubmissionAttachmentRepository submissionAttachmentRepository;
 
     @Autowired
-    private ClassStudentRepository classStudentRepository;
-
-    @Autowired
-    private ClassStudentService classStudentService;
+    private RosterService rosterService;
 
     // ============================ 页 1：作业列表 ============================
 
@@ -83,9 +78,9 @@ public class StudentHomeworkService {
      */
     @Transactional(readOnly = true)
     public BasePageResult<StudentHomeworkVo> list(String tab, com.yunhai.homework.model.BasePageQuery query) {
-        List<ClassStudent> me = classStudentService.resolveMe();
-        List<String> myClassIds = me.stream().map(ClassStudent::getClassId).distinct().collect(Collectors.toList());
-        Integer myStudentId = me.get(0).getStudentId();
+        List<RosterService.RosterEntry> me = rosterService.mine();
+        List<Integer> myClassIds = me.stream().map(e -> e.classId).distinct().collect(Collectors.toList());
+        Integer myStudentId = me.get(0).studentId;
 
         List<Integer> homeworkIds = homeworkClassRepository.findHomeworkIdsByClassIds(myClassIds);
         if (homeworkIds.isEmpty()) {
@@ -182,16 +177,16 @@ public class StudentHomeworkService {
         if (status != HwStatusEnum.PUBLISHED && status != HwStatusEnum.CLOSED) {
             return;
         }
-        ClassStudent mine = classStudentService.resolveMe().get(0);
+        RosterService.RosterEntry mine = rosterService.mine().get(0);
         LocalDateTime now = LocalDateTime.now();
-        HomeworkReadRecord record = readRecordRepository.findByHomeworkIdAndStudentId(id, mine.getStudentId())
+        HomeworkReadRecord record = readRecordRepository.findByHomeworkIdAndStudentId(id, mine.studentId)
                 .orElse(null);
         if (record == null) {
             record = new HomeworkReadRecord();
             record.setHomeworkId(id);
-            record.setStudentId(mine.getStudentId());
-            record.setStudentName(mine.getStudentName());
-            record.setClassId(mine.getClassId());
+            record.setStudentId(mine.studentId);
+            record.setStudentName(mine.studentName);
+            record.setClassId(mine.classId);
             record.setIsRead(1);
             record.setFirstReadAt(now);
             record.setLastReadAt(now);
@@ -210,9 +205,9 @@ public class StudentHomeworkService {
     @Transactional(readOnly = true)
     public StudentResultVo result(Integer id) {
         Homework homework = requireVisible(id);
-        ClassStudent mine = classStudentService.resolveMe().get(0);
+        RosterService.RosterEntry mine = rosterService.mine().get(0);
         List<HomeworkSubmission> versions =
-                submissionRepository.findByHomeworkIdAndStudentIdOrderByVersionDesc(id, mine.getStudentId());
+                submissionRepository.findByHomeworkIdAndStudentIdOrderByVersionDesc(id, mine.studentId);
         StudentResultVo vo = new StudentResultVo();
         vo.setHomeworkId(id);
         vo.setHomeworkTitle(homework.getTitle());
@@ -281,7 +276,7 @@ public class StudentHomeworkService {
     // ============================ 提交内核 ============================
 
     private Integer doSubmit(Homework homework, String text, List<AttachmentItem> attachments) {
-        ClassStudent mine = classStudentService.resolveMe().get(0);
+        RosterService.RosterEntry mine = rosterService.mine().get(0);
         HwStatusEnum hwStatus = HwStatusEnum.of(homework.getHwStatus());
         if (hwStatus == HwStatusEnum.ARCHIVED) {
             throw new BizException(ErrorCode.FORBIDDEN, "作业已归档，不可提交");
@@ -320,9 +315,9 @@ public class StudentHomeworkService {
         }
         HomeworkSubmission submission = new HomeworkSubmission();
         fillSnapshot(submission, homework);
-        submission.setStudentId(mine.getStudentId());
-        submission.setStudentName(mine.getStudentName());
-        submission.setVersion(nextVersion(homework.getId(), mine.getStudentId()));
+        submission.setStudentId(mine.studentId);
+        submission.setStudentName(mine.studentName);
+        submission.setVersion(nextVersion(homework.getId(), mine.studentId));
         submission.setIsLatest(1);
         submission.setStatus(late ? SubmitStatusEnum.LATE_SUBMITTED.getCode() : SubmitStatusEnum.SUBMITTED.getCode());
         submission.setIsLate(late ? 1 : 0);
@@ -333,10 +328,10 @@ public class StudentHomeworkService {
 
         int sort = 0;
         for (AttachmentItem item : items) {
-            SubmissionAttachment sa = new SubmissionAttachment();
-            sa.setSubmissionId(submission.getId());
-            sa.setHomeworkId(homework.getId());
-            sa.setStudentId(mine.getStudentId());
+        SubmissionAttachment sa = new SubmissionAttachment();
+        sa.setSubmissionId(submission.getId());
+        sa.setHomeworkId(homework.getId());
+        sa.setStudentId(mine.studentId);
             sa.setFileId(item.getFileId());
             sa.setFileUrl(item.getFileUrl());
             sa.setFileType(item.getFileType());
@@ -355,15 +350,15 @@ public class StudentHomeworkService {
 
     private void fillSnapshot(HomeworkSubmission submission, Homework homework) {
         submission.setHomeworkId(homework.getId());
-        ClassStudent mine = classStudentService.resolveMe().get(0);
-        submission.setClassId(mine.getClassId());
-        submission.setClassName(mine.getClassName() == null ? mine.getClassId() : mine.getClassName());
+        RosterService.RosterEntry mine = rosterService.mine().get(0);
+        submission.setClassId(mine.classId);
+        submission.setClassName(mine.className == null ? String.valueOf(mine.classId) : mine.className);
         // studentId/studentName 由调用方覆盖（fillSnapshot 先行填充默认）
         if (submission.getStudentId() == null) {
-            submission.setStudentId(mine.getStudentId());
+            submission.setStudentId(mine.studentId);
         }
         if (submission.getStudentName() == null) {
-            submission.setStudentName(mine.getStudentName());
+            submission.setStudentName(mine.studentName);
         }
     }
 
@@ -378,7 +373,8 @@ public class StudentHomeworkService {
         if (!visibleStatus(HwStatusEnum.of(homework.getHwStatus()))) {
             throw new BizException(ErrorCode.FORBIDDEN, "作业不在可见范围");
         }
-        List<String> myClassIds = classStudentService.resolveMyClassIds();
+        List<Integer> myClassIds = rosterService.mine().stream()
+                .map(e -> e.classId).distinct().collect(Collectors.toList());
         boolean hit = homeworkClassRepository.findByHomeworkId(homeworkId).stream()
                 .map(HomeworkClass::getClassId)
                 .anyMatch(myClassIds::contains);
@@ -397,7 +393,7 @@ public class StudentHomeworkService {
     }
 
     private HomeworkSubmission myLatest(Integer homeworkId) {
-        Integer studentId = classStudentService.resolveMyStudentId();
+        Integer studentId = rosterService.mine().get(0).studentId;
         return submissionRepository.findByHomeworkIdAndStudentIdAndIsLatest(homeworkId, studentId, 1)
                 .orElse(null);
     }
diff --git a/src/main/java/com/yunhai/homework/service/impl/TeacherHomeworkV2Service.java b/src/main/java/com/yunhai/homework/service/impl/TeacherHomeworkV2Service.java
index 035270f..91df264 100644
--- a/src/main/java/com/yunhai/homework/service/impl/TeacherHomeworkV2Service.java
+++ b/src/main/java/com/yunhai/homework/service/impl/TeacherHomeworkV2Service.java
@@ -2,7 +2,6 @@ package com.yunhai.homework.service.impl;
 
 import com.alibaba.excel.EasyExcel;
 import com.alibaba.excel.annotation.ExcelProperty;
-import com.yunhai.homework.entity.ClassStudent;
 import com.yunhai.homework.entity.Homework;
 import com.yunhai.homework.entity.HomeworkAttachment;
 import com.yunhai.homework.entity.HomeworkClass;
@@ -15,6 +14,7 @@ import com.yunhai.homework.enums.ReviewStatusEnum;
 import com.yunhai.homework.enums.SubmitStatusEnum;
 import com.yunhai.homework.model.BasePageResult;
 import com.yunhai.homework.model.bsch.SchClassDto;
+import com.yunhai.homework.model.bsch.SchGradeDto;
 import com.yunhai.homework.model.bsch.SchInfoDto;
 import com.yunhai.homework.model.bsch.SchSubjectDto;
 import com.yunhai.homework.model.bsch.SchTeachDto;
@@ -35,14 +35,12 @@ import com.yunhai.homework.model.v2.SubmissionVersionVo;
 import com.yunhai.homework.model.v2.SubjectDto;
 import com.yunhai.homework.model.v2.TeacherHomeworkQuery;
 import com.yunhai.homework.model.v2.TeachingClassVo;
-import com.yunhai.homework.repository.ClassStudentRepository;
 import com.yunhai.homework.repository.HomeworkAttachmentRepository;
 import com.yunhai.homework.repository.HomeworkClassRepository;
 import com.yunhai.homework.repository.HomeworkReadRecordRepository;
 import com.yunhai.homework.repository.HomeworkRepository;
 import com.yunhai.homework.repository.HomeworkSubmissionRepository;
 import com.yunhai.homework.repository.NotificationRepository;
-import com.yunhai.homework.repository.SchClassTeachRepository;
 import com.yunhai.homework.repository.SubmissionAttachmentRepository;
 import com.yunhai.homework.service.IClassService;
 import com.yunhai.homework.utils.PageUtils;
@@ -110,10 +108,7 @@ public class TeacherHomeworkV2Service {
     private SubmissionAttachmentRepository submissionAttachmentRepository;
 
     @Autowired
-    private ClassStudentRepository classStudentRepository;
-
-    @Autowired
-    private SchClassTeachRepository schClassTeachRepository;
+    private RosterService rosterService;
 
     @Autowired
     private NotificationRepository notificationRepository;
@@ -197,21 +192,22 @@ public class TeacherHomeworkV2Service {
         homework.setRemind1d(request.getRemind1d() == null ? 1 : request.getRemind1d());
         homework.setRemind1h(request.getRemind1h() == null ? 1 : request.getRemind1h());
         if (request.getClassIds() != null && !request.getClassIds().isEmpty()) {
-            homework.setReceiveList(String.join(",", request.getClassIds()));
+            homework.setReceiveList(request.getClassIds().stream()
+                    .map(String::valueOf).collect(Collectors.joining(",")));
         }
     }
 
-    private void saveChildren(Homework homework, List<String> classIds, List<AttachmentItem> attachments) {
+    private void saveChildren(Homework homework, List<Integer> classIds, List<AttachmentItem> attachments) {
         saveClasses(homework, classIds);
         saveAttachments(homework, attachments);
     }
 
-    private void saveClasses(Homework homework, List<String> classIds) {
+    private void saveClasses(Homework homework, List<Integer> classIds) {
         if (classIds == null || classIds.isEmpty()) {
             throw new BizException(ErrorCode.FORBIDDEN, "请至少选择一个参与班级");
         }
-        List<String> distinct = classIds.stream().filter(StringUtils::hasText).distinct().collect(Collectors.toList());
-        for (String classId : distinct) {
+        List<Integer> distinct = classIds.stream().filter(Objects::nonNull).distinct().collect(Collectors.toList());
+        for (Integer classId : distinct) {
             HomeworkClass hc = new HomeworkClass();
             hc.setHomeworkId(homework.getId());
             hc.setClassId(classId);
@@ -241,13 +237,9 @@ public class TeacherHomeworkV2Service {
         }
     }
 
-    /** 班级名快照：优先取名册，无名册时回退班级 id */
-    private String resolveClassName(String classId) {
-        return classStudentRepository.findByClassIdAndStatus(classId, 1).stream()
-                .map(ClassStudent::getClassName)
-                .filter(StringUtils::hasText)
-                .findFirst()
-                .orElse(classId);
+    /** 班级名快照：实时取 bschclass 班级列表映射，缺失时回退班级 id */
+    private String resolveClassName(Integer classId) {
+        return rosterService.className(classId);
     }
 
     // ============================ 页 2：草稿箱 ============================
@@ -437,15 +429,13 @@ public class TeacherHomeworkV2Service {
     public BasePageResult<StudentMatrixVo> students(Integer id, StudentMatrixQuery query) {
         Homework homework = stateService.requireOwned(id, UserContext.getUserId());
         List<HomeworkClass> classes = homeworkClassRepository.findByHomeworkId(id);
-        List<String> classIds = classIds(classes);
-        if (StringUtils.hasText(query.getClassId())) {
+        List<Integer> classIds = classIds(classes);
+        if (query.getClassId() != null) {
             classIds = classIds.stream().filter(c -> c.equals(query.getClassId())).collect(Collectors.toList());
         }
 
-        // 名册（班级×学生）
-        List<ClassStudent> roster = classIds.isEmpty()
-                ? new ArrayList<>()
-                : classStudentRepository.findByClassIdInAndStatus(classIds, 1);
+        // 名册（班级×学生，实时 bschclass）
+        List<RosterService.RosterEntry> roster = rosterService.roster(classIds);
         Map<Integer, HomeworkReadRecord> readMap = readRecordRepository.findByHomeworkId(id).stream()
                 .collect(Collectors.toMap(HomeworkReadRecord::getStudentId, r -> r, (a, b) -> a));
         Map<Integer, HomeworkSubmission> latestMap = submissionRepository.findByHomeworkIdAndIsLatest(id, 1).stream()
@@ -457,17 +447,17 @@ public class TeacherHomeworkV2Service {
                 .collect(Collectors.groupingBy(SubmissionAttachment::getSubmissionId));
 
         List<StudentMatrixVo> rows = new ArrayList<>();
-        for (ClassStudent cs : roster) {
+        for (RosterService.RosterEntry cs : roster) {
             StudentMatrixVo row = new StudentMatrixVo();
-            row.setStudentId(cs.getStudentId());
-            row.setStudentName(cs.getStudentName());
-            row.setClassId(cs.getClassId());
-            row.setClassName(cs.getClassName());
-            HomeworkReadRecord read = readMap.get(cs.getStudentId());
+            row.setStudentId(cs.studentId);
+            row.setStudentName(cs.studentName);
+            row.setClassId(cs.classId);
+            row.setClassName(cs.className);
+            HomeworkReadRecord read = readMap.get(cs.studentId);
             row.setIsRead(read != null && read.getIsRead() != null && read.getIsRead() == 1 ? 1 : 0);
             row.setFirstReadAt(read == null ? null : read.getFirstReadAt());
             row.setLastReadAt(read == null ? null : read.getLastReadAt());
-            HomeworkSubmission sub = latestMap.get(cs.getStudentId());
+            HomeworkSubmission sub = latestMap.get(cs.studentId);
             if (sub == null) {
                 row.setSubmissionId(0);
                 row.setSubmitStatus(SubmitStatusEnum.NOT_SUBMITTED.getCode());
@@ -854,31 +844,66 @@ public class TeacherHomeworkV2Service {
     // ============================ 班级树 / 名册 ============================
 
     /**
-     * 年级→班级树（发布选班；来自名册快照聚合）。
+     * 年级→班级树（发布选班；全校班级，不按学科过滤）。
      */
     @Transactional(readOnly = true)
     public List<ClassTreeNode> classTree() {
-        Integer schId = UserContext.getSchId();
-        if (schId == null) {
+        return classTree(null);
+    }
+
+    /**
+     * 年级→班级树（发布选班）。数据源 bschclass 实时接口：班级 GetVClassList、
+     * 年级 GetSchLenLevellist、在班人数 GetClaArrStulist（一次批量外呼）；
+     * subId 非空时仅保留当前教师该学科的任教班级（GetSchTeachlist），空年级组不保留。
+     */
+    @Transactional(readOnly = true)
+    public List<ClassTreeNode> classTree(String subId) {
+        // subId=null 为无参全校树；显式传入空白串视为参数错误
+        if (subId != null && !StringUtils.hasText(subId.trim())) {
+            throw new BizException(ErrorCode.PARAM_ERROR, "学科编码（subId）不得为空");
+        }
+        String schSerId = currentSchSerId();
+        if (schSerId == null) {
             return new ArrayList<>();
         }
-        List<Object[]> rows = classStudentRepository.findDistinctClasses(schId);
-        Map<String, List<Object[]>> byGrade = rows.stream()
-                .collect(Collectors.groupingBy(r -> r[2] == null || !StringUtils.hasText(r[2].toString())
-                        ? "未分组" : r[2].toString(), java.util.LinkedHashMap::new, Collectors.toList()));
+        Set<Integer> scope = null;
+        if (StringUtils.hasText(subId)) {
+            scope = teachingClassIds(schSerId, subId.trim());
+            if (scope.isEmpty()) {
+                return new ArrayList<>();
+            }
+        }
+        List<SchClassDto> classes = classService.getSchClassList(schSerId);
+        Map<Integer, String> gradeNames = gradeNames(schSerId);
+        Map<Integer, List<SchClassDto>> byGrade = new java.util.LinkedHashMap<>();
+        List<Integer> scopeIds = new ArrayList<>();
+        for (SchClassDto c : classes) {
+            if (c == null || c.getClassId() == null || (scope != null && !scope.contains(c.getClassId()))) {
+                continue;
+            }
+            byGrade.computeIfAbsent(c.getGradeId(), k -> new ArrayList<>()).add(c);
+            scopeIds.add(c.getClassId());
+        }
+        if (scopeIds.isEmpty()) {
+            return new ArrayList<>();
+        }
+        Map<Integer, Integer> counts = rosterService.studentCounts(scopeIds);
         List<ClassTreeNode> tree = new ArrayList<>();
-        for (Map.Entry<String, List<Object[]>> entry : byGrade.entrySet()) {
+        for (Map.Entry<Integer, List<SchClassDto>> entry : byGrade.entrySet()) {
+            Integer gradeId = entry.getKey();
+            String gradeName = gradeId != null && gradeNames.containsKey(gradeId)
+                    ? gradeNames.get(gradeId) : "未分组";
             ClassTreeNode grade = new ClassTreeNode();
-            grade.setId(entry.getKey());
-            grade.setName(entry.getKey());
+            grade.setId(gradeId == null ? gradeName : String.valueOf(gradeId));
+            grade.setName(gradeName);
             grade.setIsParent(true);
-            for (Object[] r : entry.getValue()) {
-                String classId = String.valueOf(r[0]);
+            for (SchClassDto c : entry.getValue()) {
                 ClassTreeNode leaf = new ClassTreeNode();
-                leaf.setId(classId);
-                leaf.setName(r[1] == null || !StringUtils.hasText(r[1].toString()) ? classId : r[1].toString());
+                leaf.setId(String.valueOf(c.getClassId()));
+                leaf.setName(StringUtils.hasText(c.getClassName())
+                        ? c.getClassName() : String.valueOf(c.getClassId()));
                 leaf.setIsParent(false);
-                leaf.setStudentCount(classStudentRepository.findByClassIdAndStatus(classId, 1).size());
+                leaf.setStudentCount(counts.getOrDefault(c.getClassId(), 0));
                 grade.getChildren().add(leaf);
             }
             tree.add(grade);
@@ -886,6 +911,39 @@ public class TeacherHomeworkV2Service {
         return tree;
     }
 
+    /**
+     * 当前教师在 bschclass 的 subId 学科任教班级ID集合（实时 GetSchTeachlist，
+     * sch_class.class_id 取值域）；远端不可用时异常向上抛，登录身份缺失时返回空集合。
+     */
+    private Set<Integer> teachingClassIds(String schSerId, String subId) {
+        Set<Integer> ids = new LinkedHashSet<>();
+        Integer userId = UserContext.getUserId();
+        if (schSerId == null || userId == null) {
+            return ids;
+        }
+        for (SchTeachDto teach : classService.getSchTeachList(schSerId, userId)) {
+            if (subId.equals(teach.getSubId()) && teach.getClassId() != null) {
+                ids.add(teach.getClassId());
+            }
+        }
+        return ids;
+    }
+
+    /** 学校年级ID → 年级名（bschclass GetSchLenLevellist；远端失败降级空映射，班级归入「未分组」） */
+    private Map<Integer, String> gradeNames(String schSerId) {
+        Map<Integer, String> names = new java.util.LinkedHashMap<>();
+        try {
+            for (SchGradeDto g : classService.getSchGradeList(schSerId)) {
+                if (g != null && g.getId() != null && StringUtils.hasText(g.getName())) {
+                    names.put(g.getId(), g.getName());
+                }
+            }
+        } catch (BizException e) {
+            log.warn("[classTree] 年级列表拉取失败, 降级「未分组」展示: {}", e.getMessage());
+        }
+        return names;
+    }
+
     // ============================ 学科（我布置的 / 我任教的） ============================
 
     /**
@@ -909,49 +967,27 @@ public class TeacherHomeworkV2Service {
     }
 
     /**
-     * 我的任教学科：bschclass 任教关系（sch_class_teach）当前教师去重学科，
-     * 名称经本校学科字典解析。
+     * 我的任教学科：bschclass 任教关系当前教师去重学科，名称经本校学科字典解析。
      */
     public List<SubjectDto> teachingSubjects() {
         return toSubjectDtos(teachingSubjectCodes(), subjectDictionary());
     }
 
     /**
-     * 我的任教去重学科编码：bschclass 任教关系（sch_class_teach）当前教师。
-     * 登录身份缺学校/教师信息时返回空集合；远端不可用时降级读本地任教快照
-     * （sch_class_teach，同 class_student 口径），快照也无记录则保持原语义向上抛出。
+     * 我的任教去重学科编码：bschclass 任教关系（GetSchTeachlist）当前教师，实时获取。
+     * 登录身份缺学校/教师信息时返回空集合；远端不可用时异常向上抛
+     * （assignedSubjects 捕获后仅返回布置学科）。
      */
     private Set<String> teachingSubjectCodes() {
         Set<String> codes = new LinkedHashSet<>();
-        try {
-            for (SchTeachDto teach : currentTeachList()) {
-                if (StringUtils.hasText(teach.getSubId())) {
-                    codes.add(teach.getSubId());
-                }
+        for (SchTeachDto teach : currentTeachList()) {
+            if (StringUtils.hasText(teach.getSubId())) {
+                codes.add(teach.getSubId());
             }
-        } catch (BizException e) {
-            codes.addAll(localTeachingSubIds());
-            if (codes.isEmpty()) {
-                throw e;
-            }
-            log.warn("[teachingSubjectCodes] bschclass 任教拉取失败, 降级本地任教快照: {}", e.getMessage());
         }
         return codes;
     }
 
-    /**
-     * 当前教师在本地任教快照（sch_class_teach）中的去重学科编码；
-     * 缺学校/教师身份时返回空集合。
-     */
-    private Set<String> localTeachingSubIds() {
-        Integer schId = UserContext.getSchId();
-        Integer userId = UserContext.getUserId();
-        if (schId == null || userId == null) {
-            return Collections.emptySet();
-        }
-        return new LinkedHashSet<>(schClassTeachRepository.findDistinctSubIds(schId, userId));
-    }
-
     /**
      * 按学科筛选我的任教班级：任教关系当前教师该学科的班级去重，
      * 班级名称取学校班级列表（bschclass GetVClassList）映射并按其排序输出，
@@ -966,12 +1002,7 @@ public class TeacherHomeworkV2Service {
         if (schSerId == null || userId == null) {
             return new ArrayList<>();
         }
-        Set<Integer> classIds = new LinkedHashSet<>();
-        for (SchTeachDto teach : classService.getSchTeachList(schSerId, userId)) {
-            if (subId.equals(teach.getSubId()) && teach.getClassId() != null) {
-                classIds.add(teach.getClassId());
-            }
-        }
+        Set<Integer> classIds = teachingClassIds(schSerId, subId);
         if (classIds.isEmpty()) {
             return new ArrayList<>();
         }
@@ -994,7 +1025,7 @@ public class TeacherHomeworkV2Service {
 
     private static TeachingClassVo teachingClassVo(Integer classId, String className) {
         TeachingClassVo vo = new TeachingClassVo();
-        vo.setClassId(String.valueOf(classId));
+        vo.setClassId(classId);
         vo.setClassName(StringUtils.hasText(className) ? className : String.valueOf(classId));
         return vo;
     }
@@ -1012,7 +1043,7 @@ public class TeacherHomeworkV2Service {
     }
 
     /**
-     * 当前教师在 bschclass 的任教关系明细（sch_class_teach）。
+     * 当前教师在 bschclass 的任教关系明细（GetSchTeachlist 实时）。
      * 登录身份缺学校/教师信息时返回空列表；远端不可用时抛 BizException，由调用方决定是否降级。
      */
     private List<SchTeachDto> currentTeachList() {
@@ -1132,20 +1163,13 @@ public class TeacherHomeworkV2Service {
 
     // ============================ 名册辅助 ============================
 
-    /** 参与班级在班学生 id 集合 */
+    /** 参与班级在班学生 id 集合（实时 bschclass 名册） */
     private List<Integer> rosterStudentIds(Integer homeworkId) {
-        return roster(homeworkId).stream().map(ClassStudent::getStudentId).collect(Collectors.toList());
+        return rosterService.roster(classIds(homeworkClassRepository.findByHomeworkId(homeworkId)))
+                .stream().map(e -> e.studentId).collect(Collectors.toList());
     }
 
-    private List<ClassStudent> roster(Integer homeworkId) {
-        List<String> classIds = classIds(homeworkClassRepository.findByHomeworkId(homeworkId));
-        if (classIds.isEmpty()) {
-            return new ArrayList<>();
-        }
-        return classStudentRepository.findByClassIdInAndStatus(classIds, 1);
-    }
-
-    private static List<String> classIds(List<HomeworkClass> classes) {
+    private static List<Integer> classIds(List<HomeworkClass> classes) {
         return classes.stream().map(HomeworkClass::getClassId).collect(Collectors.toList());
     }