diff --git a/dsLightRag/Routes/TeachingModel/api/ThemeController.py b/dsLightRag/Routes/TeachingModel/api/ThemeController.py
index 6b9ccf12..8182c37c 100644
--- a/dsLightRag/Routes/TeachingModel/api/ThemeController.py
+++ b/dsLightRag/Routes/TeachingModel/api/ThemeController.py
@@ -81,7 +81,7 @@ async def save(request: Request):
     bureau_id = await get_request_str_param(request, "bureau_id", True, True)
 
     # 校验参数
-    check_theme_sql = "SELECT theme_name FROM t_ai_teaching_model_theme WHERE is_deleted = 0 and bureau_id = '" + bureau_id + "' and theme_name = '" + theme_name + "'"
+    check_theme_sql = f"SELECT theme_name FROM t_ai_teaching_model_theme WHERE is_deleted = 0 and stage_id = {stage_id} and subject_id = {subject_id} and bureau_id = '{bureau_id}' and theme_name = '{theme_name}'"
     if id != 0:
         check_theme_sql += " and id <> " + str(id)
     print(check_theme_sql)
@@ -138,6 +138,11 @@ async def get(request: Request):
 async def delete(request: Request):
     # 获取参数
     id = await get_request_num_param(request, "id", True, True, None)
+    # 查询该主题下是否存在有效文档
+    check_document_sql: str = f"SELECT id FROM t_ai_teaching_model_document WHERE is_deleted = 0 and theme_id = {id}"
+    check_document_result = await find_by_sql(check_document_sql,())
+    if check_document_result is not None:
+        return {"success": False, "message": "该主题下存在有效文档，不能删除！"}
     result = await delete_by_id("t_ai_teaching_model_theme", "id", id)
     if not result:
         return {"success": False, "message": "删除失败！"}
diff --git a/dsLightRag/Routes/TeachingModel/tasks/BackgroundTasks.py b/dsLightRag/Routes/TeachingModel/tasks/BackgroundTasks.py
index c6ee9c4a..f5cacbf2 100644
--- a/dsLightRag/Routes/TeachingModel/tasks/BackgroundTasks.py
+++ b/dsLightRag/Routes/TeachingModel/tasks/BackgroundTasks.py
@@ -34,7 +34,9 @@ async def train_document_task():
                 print(datetime.datetime.now(), "存在未训练的文档" + str(len(no_train_document_result))+"个")
                 # 这里可以根据train_flag的值来判断是训练还是删除
                 document = no_train_document_result[0]
-                theme = await find_by_id("t_ai_teaching_model_theme", "id", document["theme_id"])
+                select_theme_sql: str = f"select * from t_ai_teaching_model_theme where id = {document['theme_id']}"
+                select_theme_result = await find_by_sql(select_theme_sql, ())
+                theme = select_theme_result[0] if select_theme_result else None
                 document_name = document["document_name"] + "." + document["document_suffix"]
                 working_dir = "Topic/" + theme["short_name"]
                 document_path = document["document_path"]