diff --git a/src/app.js b/src/app.js
index 9fca57eb..2f6d09cb 100644
--- a/src/app.js
+++ b/src/app.js
@@ -141,40 +141,10 @@ class Application {
             if (buf && buf.length && !buf.toString(encoding || 'utf8').trim()) {
               throw new Error('Invalid JSON: empty body')
             }
-            // 注意：不在这里修改buffer，避免导致JSON解析错误
           }
         })
       )
       this.app.use(express.urlencoded({ extended: true, limit: '10mb' }))
-
-      // 🧹 JSON 解析错误处理中间件
-      this.app.use((err, req, res, next) => {
-        if (err instanceof SyntaxError && err.status === 400 && 'body' in err) {
-          // JSON 解析错误统一处理
-          logger.warn('🚨 JSON parsing error detected:', err.message)
-          
-          // 检查是否是常见的JSON解析错误
-          if (
-            err.message.includes('Unexpected end of JSON input') ||
-            err.message.includes('Unexpected token') ||
-            err.message.includes('Expected property name') ||
-            err.message.includes('in JSON at position') ||
-            err.message.includes('surrogate') ||
-            err.message.includes('UTF-16') ||
-            err.message.includes('invalid character')
-          ) {
-            return res.status(400).json({
-              type: 'error',
-              error: {
-                type: 'invalid_request_error',
-                message: 'Invalid JSON format in request body. Please ensure the request contains valid JSON data.'
-              }
-            })
-          }
-        }
-        next(err)
-      })
-
       this.app.use(securityMiddleware)
 
       // 🎯 信任代理
diff --git a/src/routes/api.js b/src/routes/api.js
index 9f66bc6d..3b1c4160 100644
--- a/src/routes/api.js
+++ b/src/routes/api.js
@@ -12,52 +12,11 @@ const sessionHelper = require('../utils/sessionHelper')
 
 const router = express.Router()
 
-// 🧹 Unicode 字符清理函数
-function cleanUnicodeString(str) {
-  if (typeof str !== 'string') {
-    return str
-  }
-
-  // 移除无效的 UTF-16 代理对字符
-  // 匹配无效的低代理字符 (0xDC00-0xDFFF) 没有对应的高代理字符
-  // 匹配无效的高代理字符 (0xD800-0xDBFF) 没有对应的低代理字符
-  return str.replace(
-    /[\uDC00-\uDFFF](?![\uD800-\uDBFF])|[\uD800-\uDBFF](?![\uDC00-\uDFFF])/g,
-    '\uFFFD'
-  )
-}
-
-// 🧹 递归清理对象中的 Unicode 字符
-function cleanUnicodeInObject(obj) {
-  if (typeof obj === 'string') {
-    return cleanUnicodeString(obj)
-  }
-
-  if (Array.isArray(obj)) {
-    return obj.map((item) => cleanUnicodeInObject(item))
-  }
-
-  if (obj && typeof obj === 'object') {
-    const cleaned = {}
-    for (const [key, value] of Object.entries(obj)) {
-      cleaned[cleanUnicodeString(key)] = cleanUnicodeInObject(value)
-    }
-    return cleaned
-  }
-
-  return obj
-}
-
 // 🔧 共享的消息处理函数
 async function handleMessagesRequest(req, res) {
   try {
     const startTime = Date.now()
 
-    // Unicode 字符清理 - 在输入验证之前清理请求体
-    if (req.body) {
-      req.body = cleanUnicodeInObject(req.body)
-    }
-
     // 严格的输入验证
     if (!req.body || typeof req.body !== 'object') {
       return res.status(400).json({