diff --git a/wx/V3/WxV3PaymentTait.php b/wx/V3/WxV3PaymentTait.php
index 1f69e3a..3fdc34e 100644
--- a/wx/V3/WxV3PaymentTait.php
+++ b/wx/V3/WxV3PaymentTait.php
@@ -76,7 +76,7 @@ trait WxV3PaymentTait
         $config = $this->getPayConfig();
 
         $parseUrl = '/v3/pay/transactions/out-trade-no/' . $orderNo . '?mchid=' . $config->pay->wx->mchId;
-        $sign     = $this->signature('POST', $parseUrl, "");
+        $sign     = $this->signature('POST', urlencode($parseUrl), "");
 
         $client = $this->createClient($sign, "");
         $client->get($parseUrl);