diff --git a/apps/services/conversation.py b/apps/services/conversation.py
index 9068badfcd273712d5d98f2ef1397b65187fed05..d436295e0cbfcb30845ac647b41328a6d2b33b56 100644
--- a/apps/services/conversation.py
+++ b/apps/services/conversation.py
@@ -12,7 +12,6 @@ from apps.schemas.collection import Conversation, KnowledgeBaseItem, LLMItem
 from apps.services.knowledge import KnowledgeBaseManager
 from apps.services.llm import LLMManager
 from apps.services.task import TaskManager
-from apps.services.user import UserManager
 from apps.templates.generate_llm_operator_config import llm_provider_dict
 from apps.llm.adapters import get_provider_from_endpoint
 from apps.llm.enum import DefaultModelId
@@ -48,6 +47,7 @@ class ConversationManager:
             *, debug: bool) -> Conversation | None:
         """通过用户ID新建对话"""
         if not llm_id:
+            from apps.services.user import UserManager
             # 获取系统默认模型的UUID
             user_info = await UserManager.get_userinfo_by_user_sub(user_sub)
             llm = None