diff --git a/README.md b/README.md
index 341c734..5179827 100644
--- a/README.md
+++ b/README.md
@@ -111,7 +111,7 @@ pip3 install azure-cognitiveservices-speech
 {
   "open_ai_api_key": "YOUR API KEY",                          # 填入上面创建的 OpenAI API KEY
   "model": "gpt-3.5-turbo",                                   # 模型名称。当use_azure_chatgpt为true时，其名称为Azure上model deployment名称
-  "proxy": "127.0.0.1:7890",                                  # 代理客户端的ip和端口
+  "proxy": "",                                                # 代理客户端的ip和端口，国内网络环境需要填该项，如 "127.0.0.1:7890"
   "single_chat_prefix": ["bot", "@bot"],                      # 私聊时文本需要包含该前缀才能触发机器人回复
   "single_chat_reply_prefix": "[bot] ",                       # 私聊时自动回复的前缀，用于区分真人
   "group_chat_prefix": ["@bot"],                              # 群聊时包含该前缀则会触发机器人回复
diff --git a/bot/linkai/link_ai_bot.py b/bot/linkai/link_ai_bot.py
index 8b8ca8b..c95113a 100644
--- a/bot/linkai/link_ai_bot.py
+++ b/bot/linkai/link_ai_bot.py
@@ -29,18 +29,24 @@ class LinkAIBot(Bot, OpenAIImage):
         if context.type == ContextType.TEXT:
             return self._chat(query, context)
         elif context.type == ContextType.IMAGE_CREATE:
-            ok, retstring = self.create_img(query, 0)
-            reply = None
+            ok, res = self.create_img(query, 0)
             if ok:
-                reply = Reply(ReplyType.IMAGE_URL, retstring)
+                reply = Reply(ReplyType.IMAGE_URL, res)
             else:
-                reply = Reply(ReplyType.ERROR, retstring)
+                reply = Reply(ReplyType.ERROR, res)
             return reply
         else:
             reply = Reply(ReplyType.ERROR, "Bot不支持处理{}类型的消息".format(context.type))
             return reply
 
-    def _chat(self, query, context, retry_count=0):
+    def _chat(self, query, context, retry_count=0) -> Reply:
+        """
+        发起对话请求
+        :param query: 请求提示词
+        :param context: 对话上下文
+        :param retry_count: 当前递归重试次数
+        :return: 回复
+        """
         if retry_count >= 2:
             # exit from retry 2 times
             logger.warn("[LINKAI] failed after maximum number of retry times")
@@ -63,10 +69,8 @@ class LinkAIBot(Bot, OpenAIImage):
             if app_code and session.messages[0].get("role") == "system":
                 session.messages.pop(0)
 
-            logger.info(f"[LINKAI] query={query}, app_code={app_code}")
-
             body = {
-                "appCode": app_code,
+                "app_code": app_code,
                 "messages": session.messages,
                 "model": conf().get("model") or "gpt-3.5-turbo",  # 对话模型的名称
                 "temperature": conf().get("temperature"),
@@ -74,31 +78,34 @@ class LinkAIBot(Bot, OpenAIImage):
                 "frequency_penalty": conf().get("frequency_penalty", 0.0),  # [-2,2]之间，该值越大则更倾向于产生不同的内容
                 "presence_penalty": conf().get("presence_penalty", 0.0),  # [-2,2]之间，该值越大则更倾向于产生不同的内容
             }
+            logger.info(f"[LINKAI] query={query}, app_code={app_code}, mode={body.get('model')}")
             headers = {"Authorization": "Bearer " + linkai_api_key}
 
             # do http request
-            res = requests.post(url=self.base_url + "/chat/completion", json=body, headers=headers).json()
-
-            if not res or not res["success"]:
-                if res.get("code") == self.AUTH_FAILED_CODE:
-                    logger.exception(f"[LINKAI] please check your linkai_api_key, res={res}")
-                    return Reply(ReplyType.ERROR, "请再问我一次吧")
+            res = requests.post(url=self.base_url + "/chat/completions", json=body, headers=headers,
+                                timeout=conf().get("request_timeout", 180))
+            if res.status_code == 200:
+                # execute success
+                response = res.json()
+                reply_content = response["choices"][0]["message"]["content"]
+                total_tokens = response["usage"]["total_tokens"]
+                logger.info(f"[LINKAI] reply={reply_content}, total_tokens={total_tokens}")
+                self.sessions.session_reply(reply_content, session_id, total_tokens)
+                return Reply(ReplyType.TEXT, reply_content)
 
-                elif res.get("code") == self.NO_QUOTA_CODE:
-                    logger.exception(f"[LINKAI] please check your account quota, https://chat.link-ai.tech/console/account")
-                    return Reply(ReplyType.ERROR, "提问太快啦，请休息一下再问我吧")
+            else:
+                response = res.json()
+                error = response.get("error")
+                logger.error(f"[LINKAI] chat failed, status_code={res.status_code}, "
+                             f"msg={error.get('message')}, type={error.get('type')}")
 
-                else:
-                    # retry
+                if res.status_code >= 500:
+                    # server error, need retry
                     time.sleep(2)
                     logger.warn(f"[LINKAI] do retry, times={retry_count}")
                     return self._chat(query, context, retry_count + 1)
 
-            # execute success
-            reply_content = res["data"]["content"]
-            logger.info(f"[LINKAI] reply={reply_content}")
-            self.sessions.session_reply(reply_content, session_id)
-            return Reply(ReplyType.TEXT, reply_content)
+                return Reply(ReplyType.ERROR, "提问太快啦，请休息一下再问我吧")
 
         except Exception as e:
             logger.exception(e)