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 b86d492..df6146b 100644
--- a/src/main/java/com/sztzjy/linkCommerce/service/impl/TrainingTaskServiceImpl.java
+++ b/src/main/java/com/sztzjy/linkCommerce/service/impl/TrainingTaskServiceImpl.java
@@ -197,11 +197,17 @@ public class TrainingTaskServiceImpl implements TrainingTaskService {
 
     @Override
     public List<TrainingTask> listForTeachingClass(String teachingClassId, Boolean enabledOnly, JwtUser operator) {
-        requireReadableTeachingClass(teachingClassId, operator);
-        ensureDefaultTasks(null);
+        SchoolClass teachingClass = requireReadableTeachingClass(teachingClassId, operator);
+        boolean ownedByOperator = StringUtils.equals(teachingClass.getCreatedBy(), operator.getUserId());
+        if (ownedByOperator) {
+            ensureDefaultTasks(null);
+        }
         List<TrainingTask> defaults = trainingTaskMapper.selectList(null, null, null);
-        List<TrainingTaskClassConfig> classTasks = ensureClassTasksInitialized(teachingClassId, defaults, operator.getUserId());
-        return filterEnabled(toTasks(classTasks), enabledOnly);
+        if (ownedByOperator) {
+            List<TrainingTaskClassConfig> classTasks = ensureClassTasksInitialized(teachingClassId, defaults, operator.getUserId());
+            return filterEnabled(toTasks(classTasks), enabledOnly);
+        }
+        return filterEnabled(readClassTasks(teachingClassId, defaults), enabledOnly);
     }
 
     @Override
@@ -381,12 +387,34 @@ public class TrainingTaskServiceImpl implements TrainingTaskService {
             throw new IllegalArgumentException("Teaching class not found");
         }
         if (operator == null || StringUtils.isBlank(operator.getUserId())
+                || StringUtils.isBlank(operator.getSchoolId()) || StringUtils.isBlank(schoolClass.getSchoolId())
                 || !StringUtils.equals(operator.getSchoolId(), schoolClass.getSchoolId())) {
             throw new IllegalArgumentException("Teaching class is unavailable");
         }
         return schoolClass;
     }
 
+    private List<TrainingTask> readClassTasks(String teachingClassId, List<TrainingTask> defaults) {
+        Map<String, TrainingTask> tasksByKey = new LinkedHashMap<>();
+        List<TrainingTask> sourceTasks = defaults == null || defaults.isEmpty() ? defaultTasks() : defaults;
+        for (TrainingTask task : sourceTasks) {
+            if (task != null && StringUtils.isNotBlank(task.getTaskKey())) {
+                tasksByKey.put(task.getTaskKey(), task);
+            }
+        }
+        if (trainingTaskClassConfigMapper != null) {
+            List<TrainingTaskClassConfig> classTasks = trainingTaskClassConfigMapper.selectListByTeachingClass(teachingClassId, null);
+            if (classTasks != null) {
+                for (TrainingTaskClassConfig classTask : classTasks) {
+                    if (classTask != null && StringUtils.isNotBlank(classTask.getTaskKey())) {
+                        tasksByKey.put(classTask.getTaskKey(), toTask(classTask));
+                    }
+                }
+            }
+        }
+        return sortTasks(new ArrayList<>(tasksByKey.values()));
+    }
+
     private String resolveStudentTeachingClassId(String studentUserId) {
         if (StringUtils.isBlank(studentUserId) || teachingClassStudentMapper == null) {
             return null;
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 3de30ee..360b9fc 100644
--- a/src/test/java/com/sztzjy/linkCommerce/service/impl/TrainingTaskServiceImplTest.java
+++ b/src/test/java/com/sztzjy/linkCommerce/service/impl/TrainingTaskServiceImplTest.java
@@ -336,6 +336,46 @@ class TrainingTaskServiceImplTest {
                 () -> service.requireReadableTeachingClass("class-2", reader));
     }
 
+    @Test
+    void nonOwnerSameSchoolClassTaskReadDoesNotWriteConfigurations() {
+        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 reader = new JwtUser();
+        reader.setUserId("teacher-b");
+        reader.setSchoolId("school-1");
+
+        List<TrainingTask> result = service.listForTeachingClass("class-2", false, reader);
+
+        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();
+        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");
+
+        assertThrows(IllegalArgumentException.class,
+                () -> service.requireReadableTeachingClass("class-2", reader));
+    }
+
     @Test
     void restoreClassTaskDefaultDeletesOnlySelectedClassTaskCopy() {
         TrainingTaskServiceImpl service = new TrainingTaskServiceImpl();