diff --git a/src/api/controllers/chat.ts b/src/api/controllers/chat.ts
index c9e2618..309f6bf 100644
--- a/src/api/controllers/chat.ts
+++ b/src/api/controllers/chat.ts
@@ -328,21 +328,26 @@ async function fakeRequest(refreshToken: string) {
  * @param messages 参考gpt系列消息格式，多轮对话请完整提供上下文
  */
 function extractRefFileUrls(messages: any[]) {
-  return messages.reduce((urls, message) => {
-    if (_.isArray(message.content)) {
-      message.content.forEach(v => {
-        if (!_.isObject(v) || !['file', 'image_url'].includes(v['type']))
-          return;
-        // kimi-free-api支持格式
-        if (v['type'] == 'file' && _.isObject(v['file_url']) && _.isString(v['file_url']['url']))
-          urls.push(v['file_url']['url']);
-        // 兼容gpt-4-vision-preview API格式
-        else if (v['type'] == 'image_url' && _.isObject(v['image_url']) && _.isString(v['image_url']['url']))
-          urls.push(v['image_url']['url']);
-      });
-    }
+  const urls = [];
+  // 如果没有消息，则返回[]
+  if (!messages.length) {
     return urls;
-  }, []);
+  }
+  // 只获取最新的消息
+  const lastMessage = messages[messages.length - 1];
+  if (_.isArray(lastMessage.content)) {
+    lastMessage.content.forEach(v => {
+      if (!_.isObject(v) || !['file', 'image_url'].includes(v['type']))
+        return;
+      // kimi-free-api支持格式
+      if (v['type'] == 'file' && _.isObject(v['file_url']) && _.isString(v['file_url']['url']))
+        urls.push(v['file_url']['url']);
+      // 兼容gpt-4-vision-preview API格式
+      else if (v['type'] == 'image_url' && _.isObject(v['image_url']) && _.isString(v['image_url']['url']))
+        urls.push(v['image_url']['url']);
+    });
+  }
+  return urls;
 }
 
 /**
@@ -356,8 +361,16 @@ function extractRefFileUrls(messages: any[]) {
  * @param messages 参考gpt系列消息格式，多轮对话请完整提供上下文
  */
 function messagesPrepare(messages: any[]) {
-  const content = messages.reduce((content, message) => {
-    if (_.isArray(message.content)) {
+  // 只保留最新消息以及不包含"type": "image_url"或"type": "file"的消息
+  let validMessages = messages.filter((message, index) => {
+    if (index === messages.length - 1) return true;
+    if (!Array.isArray(message.content)) return true;
+    // 不含"type": "image_url"或"type": "file"的消息保留
+    return !message.content.some(v => (typeof v === 'object' && ['file', 'image_url'].includes(v['type'])));
+  });
+
+  const content = validMessages.reduce((content, message) => {
+    if (Array.isArray(message.content)) {
       return message.content.reduce((_content, v) => {
         if (!_.isObject(v) || v['type'] != 'text')
           return _content;
@@ -366,7 +379,6 @@ function messagesPrepare(messages: any[]) {
     }
     return content += `${message.role || 'user'}:${wrapUrlsToTags(message.content)}\n`;
   }, '');
-
   return [
     { role: 'user', content }
   ]