diff --git a/core/extend/com/OAuth.php b/core/extend/com/OAuth.php
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--- /dev/null
+++ b/core/extend/com/OAuth.php
@@ -0,0 +1,15 @@
+<?php
+// +----------------------------------------------------------------------
+// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
+// +----------------------------------------------------------------------
+// | Copyright (c) 2011 http://thinkphp.cn All rights reserved.
+// +----------------------------------------------------------------------
+// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
+// +----------------------------------------------------------------------
+// | Author: luofei614 <weibo.com/luofei614>　
+// +----------------------------------------------------------------------
+namespace com;
+
+class OAuth{
+
+}
\ No newline at end of file
diff --git a/core/extend/com/Wechat.php b/core/extend/com/Wechat.php
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--- /dev/null
+++ b/core/extend/com/Wechat.php
@@ -0,0 +1,88 @@
+<?php
+// +----------------------------------------------------------------------
+// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
+// +----------------------------------------------------------------------
+// | Copyright (c) 2011 http://thinkphp.cn All rights reserved.
+// +----------------------------------------------------------------------
+// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
+// +----------------------------------------------------------------------
+// | Author: luofei614 <weibo.com/luofei614>
+// +------------------
+
+namespace com;
+/**
+ * 通用的树型类，可以生成任何树型结构
+ */
+class Wechat {
+
+	public function valid() {
+		$echoStr = $_GET["echostr"];
+
+		//valid signature , option
+		if ($this->checkSignature()) {
+			echo $echoStr;
+			exit;
+		}
+	}
+
+	public function responseMsg() {
+		//get post data, May be due to the different environments
+		$postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
+
+		//extract post data
+		if (!empty($postStr)) {
+			/* libxml_disable_entity_loader is to prevent XML eXternal Entity Injection,
+			the best way is to check the validity of xml by yourself */
+			libxml_disable_entity_loader(true);
+			$postObj      = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
+			$fromUsername = $postObj->FromUserName;
+			$toUsername   = $postObj->ToUserName;
+			$keyword      = trim($postObj->Content);
+			$time         = time();
+			$textTpl      = "<xml>
+							<ToUserName><![CDATA[%s]]></ToUserName>
+							<FromUserName><![CDATA[%s]]></FromUserName>
+							<CreateTime>%s</CreateTime>
+							<MsgType><![CDATA[%s]]></MsgType>
+							<Content><![CDATA[%s]]></Content>
+							<FuncFlag>0</FuncFlag>
+							</xml>";
+			if (!empty($keyword)) {
+				$msgType    = "text";
+				$contentStr = "Welcome to wechat world!";
+				$resultStr  = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
+				echo $resultStr;
+			} else {
+				echo "Input something...";
+			}
+
+		} else {
+			echo "";
+			exit;
+		}
+	}
+
+	private function checkSignature() {
+		// you must define TOKEN by yourself
+		if (!defined("TOKEN")) {
+			throw new Exception('TOKEN is not defined!');
+		}
+
+		$signature = $_GET["signature"];
+		$timestamp = $_GET["timestamp"];
+		$nonce     = $_GET["nonce"];
+
+		$token  = TOKEN;
+		$tmpArr = array($token, $timestamp, $nonce);
+		// use SORT_STRING rule
+		sort($tmpArr, SORT_STRING);
+		$tmpStr = implode($tmpArr);
+		$tmpStr = sha1($tmpStr);
+
+		if ($tmpStr == $signature) {
+			return true;
+		} else {
+			return false;
+		}
+	}
+}
\ No newline at end of file
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