diff --git a/src/Config.php b/src/Config.php
index a7c0e4b..36f2724 100644
--- a/src/Config.php
+++ b/src/Config.php
@@ -47,6 +47,11 @@ class Config
      */
     protected $handler;
 
+    /**
+     * @var int token 有效期
+     */
+    public $tokenExpired = 3600;
+
 
     public function __construct(string $appID = '', string $appCertificate = '', string $customerKey = '', string $customerSecret = '')
     {
@@ -240,4 +245,22 @@ public function getAppIdLen()
     {
         return strlen($this->getAppID());
     }
+
+    /**
+     * @return int
+     */
+    public function getTokenExpired(): int
+    {
+        return $this->tokenExpired;
+    }
+
+    /**
+     * @param int $tokenExpired
+     * @return Config
+     */
+    public function setTokenExpired(int $tokenExpired): Config
+    {
+        $this->tokenExpired = $tokenExpired;
+        return $this;
+    }
 }
diff --git a/src/Token/AccessToken.php b/src/Token/AccessToken.php
index 95bccd2..b4089eb 100644
--- a/src/Token/AccessToken.php
+++ b/src/Token/AccessToken.php
@@ -157,7 +157,7 @@ protected function extract(Config $config, $token)
      */
     public function build()
     {
-        $msg = $this->message->packContent();
+        $msg = $this->message->packContent($this->config->getTokenExpired());
         $val = array_merge(unpack("C*", $this->config->getAppID()), unpack("C*", $this->channelName), unpack("C*", $this->uid), $msg);
 
         $sig = hash_hmac('sha256', implode(array_map("chr", $val)), $this->config->getAppCertificate(), true);
diff --git a/src/Token/Message.php b/src/Token/Message.php
index 495385d..7a49fe9 100644
--- a/src/Token/Message.php
+++ b/src/Token/Message.php
@@ -20,10 +20,10 @@ public function __construct()
         $this->privileges = array();
     }
 
-    public function packContent()
+    public function packContent($tokenExpired = 0)
     {
         $this->salt = mt_rand(1, 99999999);
-        $this->ts = Tool::time()->timestamp;
+        $this->ts = Tool::time()->timestamp + $tokenExpired;
         $buffer = unpack("C*", pack("V", $this->salt));
         $buffer = array_merge($buffer, unpack("C*", pack("V", $this->ts)));
         $buffer = array_merge($buffer, unpack("C*", pack("v", sizeof($this->privileges))));