diff --git a/WePay/Refund.php b/WePay/Refund.php
index 16e977d..39ac36a 100644
--- a/WePay/Refund.php
+++ b/WePay/Refund.php
@@ -16,6 +16,7 @@ namespace WePay;
 
 use WeChat\Contracts\BasicWePay;
 use WeChat\Contracts\Tools;
+use WeChat\Exceptions\InvalidDecryptException;
 use WeChat\Exceptions\InvalidResponseException;
 
 /**
@@ -55,6 +56,7 @@ class Refund extends BasicWePay
     /**
      * 获取退款通知
      * @return array
+     * @throws InvalidDecryptException
      * @throws InvalidResponseException
      */
     public function getNotify()
@@ -63,11 +65,14 @@ class Refund extends BasicWePay
         if (!isset($data['return_code']) || $data['return_code'] !== 'SUCCESS') {
             throw new InvalidResponseException('获取退款通知XML失败！');
         }
-        $key = md5($this->config->get('mch_key'));
-        $decrypt = base64_decode($data['req_info']);
-        $response = openssl_decrypt($decrypt, 'aes-256-ecb', $key, OPENSSL_RAW_DATA);
-        $data['result'] = Tools::xml2arr($response);
-        return $data;
+        try {
+            $key = md5($this->config->get('mch_key'));
+            $decrypt = base64_decode($data['req_info']);
+            $response = openssl_decrypt($decrypt, 'aes-256-ecb', $key, OPENSSL_RAW_DATA);
+            $data['result'] = Tools::xml2arr($response);
+            return $data;
+        } catch (\Exception $exception) {
+            throw new InvalidDecryptException($exception->getMessage(), $exception->getCode());
+        }
     }
-
 }
\ No newline at end of file