diff --git a/backend/src/main/java/com/xly/erp/module/mod/mapper/ModuleMapper.java b/backend/src/main/java/com/xly/erp/module/mod/mapper/ModuleMapper.java
index 2464d1f..bb81f20 100644
--- a/backend/src/main/java/com/xly/erp/module/mod/mapper/ModuleMapper.java
+++ b/backend/src/main/java/com/xly/erp/module/mod/mapper/ModuleMapper.java
@@ -16,4 +16,11 @@ public interface ModuleMapper extends BaseMapper<Module> {
 
     @Select("SELECT iParentId FROM tModule WHERE iIncrement = #{id} AND bDeleted = 0")
     Integer selectParentIdById(@Param("id") Integer iIncrement);
+
+    @Select("SELECT 1 FROM tModule WHERE iParentId = #{parentId} AND bDeleted = 0 LIMIT 1")
+    Integer findActiveChildFlag(@Param("parentId") Integer parentId);
+
+    default boolean hasActiveChildren(Integer parentId) {
+        return findActiveChildFlag(parentId) != null;
+    }
 }
diff --git a/backend/src/test/java/com/xly/erp/module/mod/mapper/ModuleMapperIT.java b/backend/src/test/java/com/xly/erp/module/mod/mapper/ModuleMapperIT.java
index 527b31b..726f79f 100644
--- a/backend/src/test/java/com/xly/erp/module/mod/mapper/ModuleMapperIT.java
+++ b/backend/src/test/java/com/xly/erp/module/mod/mapper/ModuleMapperIT.java
@@ -78,6 +78,25 @@ class ModuleMapperIT {
         assertThat(moduleMapper.selectParentIdById(99999998)).isNull();
     }
 
+    @Test
+    void hasActiveChildren_trueIfChildAliveExists_falseOtherwise() {
+        Module root = newModule("sp_test_hac_root", "根", null);
+        moduleMapper.insert(root);
+
+        Module child1 = newModule("sp_test_hac_alive", "存活子", root.getIIncrement());
+        moduleMapper.insert(child1);
+
+        Module child2 = newModule("sp_test_hac_dead", "已删子", root.getIIncrement());
+        child2.setBDeleted(true);
+        moduleMapper.insert(child2);
+
+        assertThat(moduleMapper.hasActiveChildren(root.getIIncrement())).isTrue();
+        assertThat(moduleMapper.hasActiveChildren(99999996)).isFalse();
+
+        jdbcTemplate.update("UPDATE tModule SET bDeleted = 1 WHERE iIncrement = ?", child1.getIIncrement());
+        assertThat(moduleMapper.hasActiveChildren(root.getIIncrement())).isFalse();
+    }
+
     private Module newModule(String procedureName, String nameZh, Integer parentId) {
         Module m = new Module();
         m.setSBrandsId("XLY");