diff --git a/python/dify_plugin/interfaces/model/openai_compatible/llm.py b/python/dify_plugin/interfaces/model/openai_compatible/llm.py
index 34135350..4bac745f 100644
--- a/python/dify_plugin/interfaces/model/openai_compatible/llm.py
+++ b/python/dify_plugin/interfaces/model/openai_compatible/llm.py
@@ -482,10 +482,11 @@ def _generate(
         if user:
             data["user"] = user
 
+        headers['Content-Type'] = 'application/json; charset=utf-8'
         response = requests.post(
             endpoint_url,
             headers=headers,
-            json=data,
+            data=json.dumps(data, ensure_ascii=False).encode('utf-8'),
             timeout=(10, _plugin_config.MAX_REQUEST_TIMEOUT),
             stream=stream,
         )