diff --git a/src/main/java/com/sztzjy/linkCommerce/service/impl/TrainingTaskServiceImpl.java b/src/main/java/com/sztzjy/linkCommerce/service/impl/TrainingTaskServiceImpl.java
index df6146b..44f9f80 100644
--- a/src/main/java/com/sztzjy/linkCommerce/service/impl/TrainingTaskServiceImpl.java
+++ b/src/main/java/com/sztzjy/linkCommerce/service/impl/TrainingTaskServiceImpl.java
@@ -197,16 +197,8 @@ public class TrainingTaskServiceImpl implements TrainingTaskService {
 
     @Override
     public List<TrainingTask> listForTeachingClass(String teachingClassId, Boolean enabledOnly, JwtUser operator) {
-        SchoolClass teachingClass = requireReadableTeachingClass(teachingClassId, operator);
-        boolean ownedByOperator = StringUtils.equals(teachingClass.getCreatedBy(), operator.getUserId());
-        if (ownedByOperator) {
-            ensureDefaultTasks(null);
-        }
+        requireReadableTeachingClass(teachingClassId, operator);
         List<TrainingTask> defaults = trainingTaskMapper.selectList(null, null, null);
-        if (ownedByOperator) {
-            List<TrainingTaskClassConfig> classTasks = ensureClassTasksInitialized(teachingClassId, defaults, operator.getUserId());
-            return filterEnabled(toTasks(classTasks), enabledOnly);
-        }
         return filterEnabled(readClassTasks(teachingClassId, defaults), enabledOnly);
     }
 
diff --git a/src/test/java/com/sztzjy/linkCommerce/service/impl/TrainingTaskServiceImplTest.java b/src/test/java/com/sztzjy/linkCommerce/service/impl/TrainingTaskServiceImplTest.java
index 360b9fc..e85d17e 100644
--- a/src/test/java/com/sztzjy/linkCommerce/service/impl/TrainingTaskServiceImplTest.java
+++ b/src/test/java/com/sztzjy/linkCommerce/service/impl/TrainingTaskServiceImplTest.java
@@ -362,6 +362,32 @@ class TrainingTaskServiceImplTest {
         verify(service.trainingTaskClassConfigMapper, never()).deleteByTeachingClassAndTaskKey(anyString(), anyString());
     }
 
+    @Test
+    void ownerClassTaskReadDoesNotWriteConfigurations() {
+        TrainingTaskServiceImpl service = new TrainingTaskServiceImpl();
+        service.trainingTaskMapper = mock(TrainingTaskMapper.class);
+        service.trainingTaskClassConfigMapper = mock(TrainingTaskClassConfigMapper.class);
+        service.schoolClassMapper = mock(SchoolClassMapper.class);
+        SchoolClass schoolClass = teachingClass("class-2", "teacher-a");
+        schoolClass.setSchoolId("school-1");
+        when(service.schoolClassMapper.selectByPrimaryKey("class-2")).thenReturn(schoolClass);
+        TrainingTask defaultTask = storedTask("task-1", "new-product-survey");
+        when(service.trainingTaskMapper.selectList(null, null, null)).thenReturn(Collections.singletonList(defaultTask));
+        when(service.trainingTaskClassConfigMapper.selectListByTeachingClass("class-2", null)).thenReturn(Collections.emptyList());
+
+        JwtUser owner = new JwtUser();
+        owner.setUserId("teacher-a");
+        owner.setSchoolId("school-1");
+
+        List<TrainingTask> result = service.listForTeachingClass("class-2", false, owner);
+
+        assertEquals(1, result.size());
+        verify(service.trainingTaskClassConfigMapper, never()).insertSelective(any());
+        verify(service.trainingTaskClassConfigMapper, never()).updateByPrimaryKeySelective(any());
+        verify(service.trainingTaskClassConfigMapper, never()).deleteByTeachingClass(anyString());
+        verify(service.trainingTaskClassConfigMapper, never()).deleteByTeachingClassAndTaskKey(anyString(), anyString());
+    }
+
     @Test
     void teacherCannotReadTeachingClassWhenSchoolIdIsMissing() {
         TrainingTaskServiceImpl service = new TrainingTaskServiceImpl();
@@ -376,6 +402,21 @@ class TrainingTaskServiceImplTest {
                 () -> service.requireReadableTeachingClass("class-2", reader));
     }
 
+    @Test
+    void teacherCannotReadTeachingClassWhenClassSchoolIdIsMissing() {
+        TrainingTaskServiceImpl service = new TrainingTaskServiceImpl();
+        service.schoolClassMapper = mock(SchoolClassMapper.class);
+        SchoolClass schoolClass = teachingClass("class-2", "teacher-a");
+        when(service.schoolClassMapper.selectByPrimaryKey("class-2")).thenReturn(schoolClass);
+
+        JwtUser reader = new JwtUser();
+        reader.setUserId("teacher-b");
+        reader.setSchoolId("school-1");
+
+        assertThrows(IllegalArgumentException.class,
+                () -> service.requireReadableTeachingClass("class-2", reader));
+    }
+
     @Test
     void restoreClassTaskDefaultDeletesOnlySelectedClassTaskCopy() {
         TrainingTaskServiceImpl service = new TrainingTaskServiceImpl();