diff --git a/src/Payment/Refund/Client.php b/src/Payment/Refund/Client.php
index fa77156..ed39d01 100755
--- a/src/Payment/Refund/Client.php
+++ b/src/Payment/Refund/Client.php
@@ -18,15 +18,19 @@ class Client extends AppClient
      * @throws \EasyAlipay\Kernel\Exceptions\InvalidSignException
      * @throws \GuzzleHttp\Exception\GuzzleException
      */
-    public function refund(string $out_trade_no,string $refund_amount)
+    public function refund(string $out_trade_no, string $refund_amount, string $refund_reason = '订单退款', string $out_request_no = '')
     {
         //构造查询业务请求参数对象
         $refundContentBuilder = new AlipayTradeRefundContentBuilder();
         $refundContentBuilder->setOutTradeNo($out_trade_no);
         $refundContentBuilder->setRefundAmount($refund_amount);
+        $refundContentBuilder->setRefundReason($refund_reason);
+        if ($out_request_no) {
+            $refundContentBuilder->setOutRequestNo($out_request_no);
+        }
         $request = new AppRequest ();
         $request->setBizContent($refundContentBuilder->getBizContent());
         $request->setApiMethodName("alipay.trade.refund");
-        return($this->execute($request)) ;
+        return ($this->execute($request));
     }
 }