diff --git a/app/Libs/WxMicroPay.class.php b/app/Libs/WxMicroPay.class.php
index 24a2b9d..63af454 100644
--- a/app/Libs/WxMicroPay.class.php
+++ b/app/Libs/WxMicroPay.class.php
@@ -20,6 +20,8 @@ class WxMicroPay extends WxPayCommon
             throw new Exception("缺少必填参数total_fee！" . "<br>");
         } elseif (!$this->parameters["auth_code"]) {
             throw new Exception("缺少必填参数auth_code！" . "<br>");
+        } elseif (!strlen($this->parameters["auth_code"]) != 18) {
+            throw new Exception("支付码不正确！" . "<br>");
         }
     }