diff --git a/channel/wechatcom/wechatcomapp_client.py b/channel/wechatcom/wechatcomapp_client.py
index c0feb7a..64d8e8a 100644
--- a/channel/wechatcom/wechatcomapp_client.py
+++ b/channel/wechatcom/wechatcomapp_client.py
@@ -1,21 +1,43 @@
+# wechatcomapp_client.py
 import threading
 import time
-
 from wechatpy.enterprise import WeChatClient
 
-
 class WechatComAppClient(WeChatClient):
     def __init__(self, corp_id, secret, access_token=None, session=None, timeout=None, auto_retry=True):
         super(WechatComAppClient, self).__init__(corp_id, secret, access_token, session, timeout, auto_retry)
         self.fetch_access_token_lock = threading.Lock()
+        self._active_refresh()
+        
+    def _active_refresh(self):
+        """启动主动刷新的后台线程"""
+        def refresh_loop():
+            while True:
+                now = time.time()
+                expires_at = self.session.get(f"{self.corp_id}_expires_at", 0)
+                
+                # 提前10分钟刷新(600秒)
+                if expires_at - now < 600:
+                    with self.fetch_access_token_lock:
+                        # 双重检查避免重复刷新
+                        if self.session.get(f"{self.corp_id}_expires_at", 0) - time.time() < 600:
+                            super(WechatComAppClient, self).fetch_access_token()
+                # 每次检查间隔60秒
+                time.sleep(60)
+                
+        # 启动守护线程
+        refresh_thread = threading.Thread(
+            target=refresh_loop,
+            daemon=True,
+            name="wechatcom_token_refresh_thread"
+        )
+        refresh_thread.start()
 
-    def fetch_access_token(self):  # 重载父类方法，加锁避免多线程重复获取access_token
+    def fetch_access_token(self):
         with self.fetch_access_token_lock:
             access_token = self.session.get(self.access_token_key)
-            if access_token:
-                if not self.expires_at:
-                    return access_token
-                timestamp = time.time()
-                if self.expires_at - timestamp > 60:
-                    return access_token
-            return super().fetch_access_token()
+            expires_at = self.session.get(f"{self.corp_id}_expires_at", 0)
+            
+            if access_token and expires_at > time.time() + 60:
+                return access_token
+            return super().fetch_access_token()
\ No newline at end of file