diff --git a/accesstoken.lib.php b/accesstoken.lib.php
new file mode 100644
index 0000000..51e266d
--- /dev/null
+++ b/accesstoken.lib.php
@@ -0,0 +1,69 @@
+<?php
+namespace LaneWeChat\Core;
+/**
+ * 微信Access_Token的获取与过期检查
+ * Created by Lane.
+ * User: lane
+ * Date: 13-12-29
+ * Time: 下午5:54
+ * Mail: lixuan868686@163.com
+ * Website: http://www.lanecn.com
+ */
+class AccessToken{
+
+    /**
+     * 获取微信Access_Token
+     */
+    public static function getAccessToken(){
+        //检测本地是否已经拥有access_token，并且检测access_token是否过期
+        $accessToken = self::_checkAccessToken();
+        if($accessToken === false){
+            $accessToken = self::_getAccessToken();
+        }
+        return $accessToken['access_token'];
+    }
+
+    /**
+     * @descrpition 从微信服务器获取微信ACCESS_TOKEN
+     * @return Ambigous|bool
+     */
+    private static function _getAccessToken(){
+        $url = 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid='.WECHAT_APPID.'&secret='.WECHAT_APPSECRET;
+        $accessToken = Curl::callWebServer($url, '', 'GET');
+        if(!isset($accessToken['access_token'])){
+            return Msg::returnErrMsg(MsgConstant::ERROR_GET_ACCESS_TOKEN, '获取ACCESS_TOKEN失败');
+        }
+        $accessToken['time'] = time();
+        $accessTokenJson = json_encode($accessToken);
+        //存入数据库
+        /**
+         * 这里通常我会把access_token存起来，然后用的时候读取，判断是否过期，如果过期就重新调用此方法获取，存取操作请自行完成
+         *
+         * 请将变量$accessTokenJson给存起来，这个变量是一个字符串
+         */
+        $f = fopen('access_token', 'w+');
+        fwrite($f, $accessTokenJson);
+        fclose($f);
+        return $accessToken;
+    }
+
+    /**
+     * @descrpition 检测微信ACCESS_TOKEN是否过期
+     *              -10是预留的网络延迟时间
+     * @return bool
+     */
+    private static function _checkAccessToken(){
+        //获取access_token。是上面的获取方法获取到后存起来的。
+//        $accessToken = YourDatabase::get('access_token');
+        $data = file_get_contents('access_token');
+        $accessToken['value'] = $data;
+        if(!empty($accessToken['value'])){
+            $accessToken = json_decode($accessToken['value'], true);
+            if(time() - $accessToken['time'] < $accessToken['expires_in']-10){
+                return $accessToken;
+            }
+        }
+        return false;
+    }
+}
+?>
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