diff --git a/dify/dify_chat.py b/dify/dify_chat.py
index 7806f01..eacf9ed 100644
--- a/dify/dify_chat.py
+++ b/dify/dify_chat.py
@@ -143,7 +143,7 @@ class DifyChat:
         data = {
             "query": query,
             "sys.files": [],
-            "sys.user_id": user_id,
+            "user": user_id,
             "response_mode": "streaming",  # 使用流式响应
             "conversation_id": session_id  # 使用会话ID保持上下文
         }