diff --git a/src/main/java/com/yunhai/workweekplan/controller/oapi/OapiWorkPlanController.java b/src/main/java/com/yunhai/workweekplan/controller/oapi/OapiWorkPlanController.java
index 4b60940..e7142b3 100644
--- a/src/main/java/com/yunhai/workweekplan/controller/oapi/OapiWorkPlanController.java
+++ b/src/main/java/com/yunhai/workweekplan/controller/oapi/OapiWorkPlanController.java
@@ -26,12 +26,15 @@ public class OapiWorkPlanController {
     private IWorkPlanService workPlanService;
 
     /**
-     * 获取本周安排（当前学年学期当前周，全校数据）。
-     * 返回结构：标题 + 周一~周日 7 天安排 + 周备注 + hasData。
+     * 获取一周安排（当前学年学期，全校数据）。
+     * week 为相对本周偏移：0=本周（默认）、-1=上一周、+1=下周，
+     * 负向至学期第 1 周、正向至学期最后一周，越界报错并提示范围（响应亦带 minWeek/maxWeek）。
+     * 返回结构：标题 + 周一~周日 7 天安排 + 周备注 + hasData + 范围提示。
      */
     @GetMapping("/Get")
     public OapiWeekPlanVo get(@RequestParam("userid") Integer userId,
-                              @RequestParam("schId") Integer schId) {
-        return workPlanService.oapiOneWeekPlan(userId, schId);
+                              @RequestParam("schId") Integer schId,
+                              @RequestParam(value = "week", required = false) Integer week) {
+        return workPlanService.oapiOneWeekPlan(userId, schId, week);
     }
 }
diff --git a/src/main/java/com/yunhai/workweekplan/model/workplan/OapiWeekPlanVo.java b/src/main/java/com/yunhai/workweekplan/model/workplan/OapiWeekPlanVo.java
index e8712fd..488e18d 100644
--- a/src/main/java/com/yunhai/workweekplan/model/workplan/OapiWeekPlanVo.java
+++ b/src/main/java/com/yunhai/workweekplan/model/workplan/OapiWeekPlanVo.java
@@ -34,4 +34,10 @@ public class OapiWeekPlanVo {
 
     /** 本周是否已有安排数据 */
     private boolean hasData;
+
+    /** week 参数允许的最小偏移（指向学期第 1 周）：0=本周，负=往前 */
+    private Integer minWeek;
+
+    /** week 参数允许的最大偏移（指向学期最后一周）：正=往后 */
+    private Integer maxWeek;
 }
diff --git a/src/main/java/com/yunhai/workweekplan/service/IWorkPlanService.java b/src/main/java/com/yunhai/workweekplan/service/IWorkPlanService.java
index 8b4a948..c459df1 100644
--- a/src/main/java/com/yunhai/workweekplan/service/IWorkPlanService.java
+++ b/src/main/java/com/yunhai/workweekplan/service/IWorkPlanService.java
@@ -34,11 +34,12 @@ public interface IWorkPlanService {
     OneWeekPlanVo getOneWeekPlan(Integer year, Integer term, Integer week);
 
     /**
-     * 开放接口：获取本周安排（当前学年学期当前周，服务端推算周次）。
+     * 开放接口：获取一周安排（当前学年学期；week 为相对本周偏移，0=本周默认、-1=上一周、+1=下周）。
      * <p>身份由调用方显式传入（不依赖登录态）；周安排为全校共享数据，无角色概念，
-     * 返回内容不因调用方不同（见 {@link OapiWeekPlanVo}，不含权限标记）。</p>
+     * 返回内容不因调用方不同（见 {@link OapiWeekPlanVo}，不含权限标记，
+     * minWeek/maxWeek 提示 week 合法范围）。</p>
      */
-    OapiWeekPlanVo oapiOneWeekPlan(Integer userId, Integer schId);
+    OapiWeekPlanVo oapiOneWeekPlan(Integer userId, Integer schId, Integer week);
 
     /** 编辑视图（本周安排行列表，含 editable 标记） */
     List<WorkPlanItemVo> getEditList(Integer year, Integer term, Integer week);
diff --git a/src/main/java/com/yunhai/workweekplan/service/impl/WorkPlanService.java b/src/main/java/com/yunhai/workweekplan/service/impl/WorkPlanService.java
index bf3c7f7..87ba9f3 100644
--- a/src/main/java/com/yunhai/workweekplan/service/impl/WorkPlanService.java
+++ b/src/main/java/com/yunhai/workweekplan/service/impl/WorkPlanService.java
@@ -141,18 +141,26 @@ public class WorkPlanService implements IWorkPlanService {
     }
 
     @Override
-    public OapiWeekPlanVo oapiOneWeekPlan(Integer userId, Integer schId) {
+    public OapiWeekPlanVo oapiOneWeekPlan(Integer userId, Integer schId, Integer week) {
         if (schId == null) {
             throw new BizException(ErrorCode.PARAM_ERROR, "schId 不能为空");
         }
         int year = nowSchoolYear();
         int term = nowSchoolTerm();
-        // 当前周次：与站内周次下拉的 current 口径一致（包含今天的那一周，周一为一周之始）；
+        // 本周：与站内周次下拉的 current 口径一致（包含今天的那一周，周一为一周之始）；
         // 早于首周（如假期）按第 1 周
         LocalDate firstDay = resolveFirstDay(schId, year, term);
-        int week = (int) (ChronoUnit.DAYS.between(firstDay, LocalDate.now()) / 7) + 1;
+        int currentWeek = Math.max((int) (ChronoUnit.DAYS.between(firstDay, LocalDate.now()) / 7) + 1, 1);
+        // week 为相对本周的偏移：0=本周（默认）、-1=上一周、+1=下周，
+        // 负向到学期第 1 周、正向到学期最后一周（边界同周次下拉 getWeektime）
+        int minWeek = 1 - currentWeek;
+        int maxWeek = lastWeekOf(year, term, firstDay) - currentWeek;
+        if (week != null && week != 0 && (week < minWeek || week > maxWeek)) {
+            throw new BizException(ErrorCode.PARAM_ERROR,
+                    "week 超出范围：最小 " + minWeek + "（学期第1周），最大 " + maxWeek + "（学期第" + (currentWeek + maxWeek) + "周）");
+        }
         // 全校共享数据，开放接口无角色概念：managerView 恒 false（权限标记不外发）
-        OneWeekPlanVo view = buildWeekView(schId, false, year, term, Math.max(week, 1));
+        OneWeekPlanVo view = buildWeekView(schId, false, year, term, currentWeek + (week == null ? 0 : week));
 
         OapiWeekPlanVo vo = new OapiWeekPlanVo();
         vo.setTitle(view.getTitle());
@@ -163,9 +171,20 @@ public class WorkPlanService implements IWorkPlanService {
         vo.setDays(view.getDays());
         vo.setRemark(view.getRemark());
         vo.setHasData(view.isHasData());
+        vo.setMinWeek(minWeek);
+        vo.setMaxWeek(maxWeek);
         return vo;
     }
 
+    /** 学期最后一周周次：首周周一起、不超过学期结束日的周数（边界同 getWeektime） */
+    private int lastWeekOf(Integer year, Integer term, LocalDate firstDay) {
+        int week = 0;
+        while (!firstDay.plusDays(week * 7L).isAfter(termEndDate(year, term))) {
+            week++;
+        }
+        return week;
+    }
+
     /** 周视图构建（站内 OneWeekPlan 与 oapi 本周安排共用；managerView 对应站内 canEditAll 口径） */
     private OneWeekPlanVo buildWeekView(Integer schId, boolean managerView, Integer year, Integer term, Integer week) {
         checkYearTerm(year, term);