diff --git a/agent/component/llm.py b/agent/component/llm.py
index 819c13809..39e043aeb 100644
--- a/agent/component/llm.py
+++ b/agent/component/llm.py
@@ -18,9 +18,8 @@ import json
 import logging
 import os
 import re
-import threading
 from copy import deepcopy
-from typing import Any, Generator, AsyncGenerator
+from typing import Any, AsyncGenerator
 import json_repair
 from functools import partial
 from common.constants import LLMType
diff --git a/api/apps/sdk/session.py b/api/apps/sdk/session.py
index 3edce4c3c..d4db3cb56 100644
--- a/api/apps/sdk/session.py
+++ b/api/apps/sdk/session.py
@@ -13,7 +13,6 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
-import asyncio
 import json
 import re
 import time
@@ -44,6 +43,7 @@ from rag.prompts.generator import cross_languages, gen_meta_filter, keyword_extr
 from common.constants import RetCode, LLMType, StatusEnum
 from common import settings
 
+
 @manager.route("/chats/<chat_id>/sessions", methods=["POST"])  # noqa: F821
 @token_required
 async def create(tenant_id, chat_id):