diff --git a/extend/payment/Baidu.php b/extend/payment/Baidu.php
index dc4674a6e55946f13e0dc0960c61312145a41110..50d35393d202a200c62eab8eda11a80d0dcb7145 100644
--- a/extend/payment/Baidu.php
+++ b/extend/payment/Baidu.php
@@ -163,7 +163,7 @@ class Baidu
                 'tpOrderId'     => $params['order_no'],
                 'totalAmount'   => (float) $params['total_price'],
                 'returnData'    => (object) [],
-                'displayData'   => (object) [],
+                'displayData'   => '',
             ],
         ];
         $data['bizInfo'] = json_encode($biz_info, JSON_UNESCAPED_UNICODE);