diff --git a/src/main/java/com/yunhai/bschclassmanage/service/impl/BaseYearTermService.java b/src/main/java/com/yunhai/bschclassmanage/service/impl/BaseYearTermService.java
index 3ee6bc4..32a3741 100644
--- a/src/main/java/com/yunhai/bschclassmanage/service/impl/BaseYearTermService.java
+++ b/src/main/java/com/yunhai/bschclassmanage/service/impl/BaseYearTermService.java
@@ -62,14 +62,31 @@ public class BaseYearTermService implements IBaseYearTermService {
     public BaseYearTerm getNowYearTerm() {
         Date now = new Date();
         List<BaseYearTerm> yearTermList = getAllYearTerm();
-        // 当前学期开始时间 <= now < 下一学期开始时间：按开始时间倒序后，取第一个已开始（开始时间<=now）的学期
+        // 升学以 upgradeDate 当天 06:00:00 为界：6点之前算上学期（当前 active 学年），6点（含）之后算新学期
+        // 取 upgradeDate@06:00 倒序后第一个 boundary <= now 的学年（即 now 落在该学年 [上学年边界, 本学年边界) 区间内）
         return yearTermList.stream()
-                .sorted(Comparator.comparing(BaseYearTerm::getYearStartDate).reversed())
-                .filter(s -> s.getYearStartDate().compareTo(now) <= 0)
+                .sorted(Comparator.comparing(
+                        (BaseYearTerm s) -> toUpgradeBoundary(s.getUpgradeDate()),
+                        Comparator.nullsLast(Comparator.naturalOrder())))
+                .filter(s -> {
+                    Date boundary = toUpgradeBoundary(s.getUpgradeDate());
+                    return boundary != null && boundary.compareTo(now) <= 0;
+                })
                 .findFirst()
                 .orElseThrow(() -> new DException("获取学年失败，当前时间不在当学年时间范围"));
     }
 
+    /**
+     * 将升学日期转换为当天 06:00:00 的边界时间（用于判定学期切换：6点之前算上学期，6点含之后算新学期）
+     */
+    private Date toUpgradeBoundary(Date upgradeDate) {
+        if (upgradeDate == null) {
+            return null;
+        }
+        LocalDate day = upgradeDate.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
+        return Date.from(day.atTime(6, 0, 0).atZone(ZoneId.systemDefault()).toInstant());
+    }
+