diff --git a/FlyCube/MpApi/Controller/PayController.class.php b/FlyCube/MpApi/Controller/PayController.class.php
index ce2c3e4..598012a 100644
--- a/FlyCube/MpApi/Controller/PayController.class.php
+++ b/FlyCube/MpApi/Controller/PayController.class.php
@@ -108,7 +108,7 @@ class PayController extends PublicController
             // 实例化 Yansongda Pay 并处理回调
             $result = Pay::wechat($this->config)->callback();
             $outRefundNo = $result['resource']['ciphertext']['out_refund_no'];
-            $refundType = substr($outRefundNo, strrpos($outRefundNo, '_'));
+            $refundType = substr($outRefundNo, strrpos($outRefundNo, '_') + 1);
             $this->publish("demo", $refundType);
 
             // 验证成功，处理业务逻辑