diff --git a/plugins/dify/main.py b/plugins/dify/main.py
index 8248274..b3d7502 100644
--- a/plugins/dify/main.py
+++ b/plugins/dify/main.py
@@ -264,7 +264,8 @@ class DifyPlugin(MessagePluginInterface):
             # 将历史记录转换为字符串格式
             for msg in self.conversations[session_id]:
                 role = "用户" if msg["role"] == "user" else "助手"
-                history_text += f"{role}: {msg['content']}\n"
+                if role == "用户":
+                    history_text += f"{role}: {msg['content']}\n"
             history_text = history_text.strip()
 
         # 准备输入参数