diff --git a/src/AlipayApp/Params/PublicParams.php b/src/AlipayApp/Params/PublicParams.php
index d39aa54..829faa2 100644
--- a/src/AlipayApp/Params/PublicParams.php
+++ b/src/AlipayApp/Params/PublicParams.php
@@ -69,6 +69,34 @@ class PublicParams extends PublicBase
 	 */
 	public $aesKey;
 
+	/**
+	 * 是否使用公钥证书模式
+	 *
+	 * @var boolean
+	 */
+	public $usePublicKeyCert = false;
+
+	/**
+	 * 支付宝公钥证书文件路径
+	 *
+	 * @var string
+	 */
+	public $alipayCertPath;
+
+	/**
+	 * 支付宝根证书文件路径
+	 *
+	 * @var string
+	 */
+	public $alipayRootCertPath;
+
+	/**
+	 * 支付宝应用公钥证书文件路径
+	 *
+	 * @var string
+	 */
+	public $merchantCertPath;
+
 	public function __construct()
 	{
 		$this->apiDomain = 'https://openapi.alipay.com/gateway.do';
diff --git a/src/AlipayApp/SDK.php b/src/AlipayApp/SDK.php
index c2ed32f..f80c3be 100644
--- a/src/AlipayApp/SDK.php
+++ b/src/AlipayApp/SDK.php
@@ -2,6 +2,7 @@
 namespace Yurun\PaySDK\AlipayApp;
 
 use \Yurun\PaySDK\Base;
+use Yurun\PaySDK\Lib\CertUtil;
 use \Yurun\PaySDK\Lib\Encrypt\AES;
 use \Yurun\PaySDK\Lib\ObjectToArray;
 
@@ -16,6 +17,43 @@ class SDK extends Base
 	 */
 	public $publicParams;
 
+	/**
+	 * 支付宝公钥证书SN
+	 *
+	 * @var string
+	 */
+	public $alipayCertSn;
+
+	/**
+	 * 应用公钥证书SN
+	 *
+	 * @var string
+	 */
+	public $appCertSn;
+
+	/**
+	 * 支付宝根证书SN
+	 *
+	 * @var string
+	 */
+	public $alipayRootCertSn;
+
+	/**
+	 * __construct
+	 *
+	 * @param \Yurun\PaySDK\AlipayApp\Params\PublicParams $publicParams
+	 */
+	public function __construct($publicParams)
+	{
+		parent::__construct($publicParams);
+		if($publicParams->usePublicKeyCert)
+		{
+			$this->alipayCertSn = CertUtil::getCertSN($publicParams->alipayCertPath);
+			$this->appCertSn = CertUtil::getCertSN($publicParams->merchantCertPath);
+			$this->alipayRootCertSn = CertUtil::getRootCertSN($publicParams->alipayRootCertPath);
+		}
+	}
+
 	/**
 	 * 处理执行接口的数据
 	 * @param $params
@@ -27,13 +65,19 @@ class SDK extends Base
 	public function __parseExecuteData($params, &$data, &$requestData, &$url)
 	{
 		$data = \array_merge(ObjectToArray::parse($this->publicParams), ObjectToArray::parse($params));
-		unset($data['apiDomain'], $data['appID'], $data['businessParams'], $data['appPrivateKey'], $data['appPrivateKeyFile'], $data['appPublicKey'], $data['appPublicKeyFile'], $data['_syncResponseName'], $data['_method'], $data['_isSyncVerify'], $data['aesKey'], $data['isUseAES']);
+		unset($data['apiDomain'], $data['appID'], $data['businessParams'], $data['appPrivateKey'], $data['appPrivateKeyFile'], $data['appPublicKey'], $data['appPublicKeyFile'], $data['_syncResponseName'], $data['_method'], $data['_isSyncVerify'], $data['aesKey'], $data['isUseAES'], $data['alipayCertPath'], $data['alipayRootCertPath'], $data['merchantCertPath'], $data['usePublicKeyCert']);
 		$data['app_id'] = $this->publicParams->appID;
 		$data['biz_content'] = $params->businessParams->toString();
 		if($this->publicParams->isUseAES)
 		{
 			$data['biz_content'] = AES::encrypt($data['biz_content'], \base64_decode($this->publicParams->aesKey));
 		}
+		// 公钥证书参数
+		if($this->publicParams->usePublicKeyCert)
+		{
+			$data['app_cert_sn'] = $this->appCertSn;
+			$data['alipay_root_cert_sn'] = $this->alipayRootCertSn;
+		}
 		$data['timestamp'] = date('Y-m-d H:i:s');
 		$data['sign'] = $this->sign($data);
 		$requestData = $data;
@@ -119,6 +163,11 @@ public function verifySync($params, $data)
 		{
 			return true;
 		}
+		// 公钥证书验证
+		if($this->publicParams->usePublicKeyCert && $this->alipayCertSn !== (isset($data['alipay_cert_sn']) ? $data['alipay_cert_sn'] : null))
+		{
+			return false;
+		}
 		$content = \json_encode($data[$params->_syncResponseName], JSON_UNESCAPED_UNICODE);
 		if(empty($this->publicParams->appPublicKeyFile))
 		{
diff --git a/src/Lib/CertUtil.php b/src/Lib/CertUtil.php
new file mode 100644
index 0000000..7aa7998
--- /dev/null
+++ b/src/Lib/CertUtil.php
@@ -0,0 +1,91 @@
+<?php
+namespace Yurun\PaySDK\Lib;
+
+/**
+ * 证书工具类
+ * 
+ * @source https://github.com/alipay/alipay-easysdk/blob/master/php/src/Kernel/Util/AntCertificationUtil.php 算法代码来自支付宝官方sdk
+ */
+class CertUtil
+{
+    /**
+     * 从证书中提取序列号
+     * @param $certPath
+     * @return string
+     */
+    public static function getCertSN($certPath)
+    {
+        $cert = file_get_contents($certPath);
+        $ssl = openssl_x509_parse($cert);
+        $SN = md5(static::array2string(array_reverse($ssl['issuer'])) . $ssl['serialNumber']);
+        return $SN;
+    }
+    
+    /**
+     * 提取根证书序列号
+     * @param $certPath  string 根证书
+     * @return string|null
+     */
+    public static function getRootCertSN($certPath)
+    {
+        $cert = file_get_contents($certPath);
+        $array = explode('-----END CERTIFICATE-----', $cert);
+        $SN = null;
+        for ($i = 0; $i < count($array) - 1; $i++)
+        {
+            $ssl[$i] = openssl_x509_parse($array[$i] . '-----END CERTIFICATE-----');
+            if (strpos($ssl[$i]['serialNumber'], '0x') === 0)
+            {
+                $ssl[$i]['serialNumber'] = static::hex2dec($ssl[$i]['serialNumber']);
+            }
+            if ($ssl[$i]['signatureTypeLN'] == 'sha1WithRSAEncryption' || $ssl[$i]['signatureTypeLN'] == 'sha256WithRSAEncryption')
+            {
+                if ($SN == null)
+                {
+                    $SN = md5(static::array2string(array_reverse($ssl[$i]['issuer'])) . $ssl[$i]['serialNumber']);
+                }
+                else
+                {
+                    $SN = $SN . '_' . md5(static::array2string(array_reverse($ssl[$i]['issuer'])) . $ssl[$i]['serialNumber']);
+                }
+            }
+        }
+        return $SN;
+    }
+
+    /**
+     * 数组转字符串
+     *
+     * @param array $array
+     * @return string
+     */
+    public static function array2string($array)
+    {
+        $string = [];
+        if ($array && is_array($array))
+        {
+            foreach ($array as $key => $value)
+            {
+                $string[] = $key . '=' . $value;
+            }
+        }
+        return implode(',', $string);
+    }
+
+    /**
+     * 0x转高精度数字
+     * @param $hex
+     * @return int|string
+     */
+    public static function hex2dec($hex)
+    {
+        $dec = 0;
+        $len = strlen($hex);
+        for ($i = 1; $i <= $len; $i++)
+        {
+            $dec = bcadd($dec, bcmul(strval(hexdec($hex[$i - 1])), bcpow('16', strval($len - $i))));
+        }
+        return $dec;
+    }
+
+}
diff --git a/test/AlipayApp/ftf_pay.php b/test/AlipayApp/ftf_pay.php
index e389c4f..0200343 100644
--- a/test/AlipayApp/ftf_pay.php
+++ b/test/AlipayApp/ftf_pay.php
@@ -9,6 +9,13 @@
 $params->appID = $GLOBALS['PAY_CONFIG']['appid'];
 $params->appPrivateKey = $GLOBALS['PAY_CONFIG']['privateKey'];
 $params->appPublicKey = $GLOBALS['PAY_CONFIG']['publicKey'];
+
+// 公钥证书演示
+$params->usePublicKeyCert = true;
+$params->alipayCertPath = __DIR__ . '/cert/alipayCertPublicKey_RSA2.crt';
+$params->alipayRootCertPath = __DIR__ . '/cert/alipayRootCert.crt';
+$params->merchantCertPath = __DIR__ . '/cert/appCertPublicKey_2016073000123475.crt';
+
 // $params->appPrivateKeyFile = ''; // 证书文件，如果设置则这个优先使用
 $params->apiDomain = 'https://openapi.alipaydev.com/gateway.do'; // 设为沙箱环境，如正式环境请把这行注释