diff --git a/application/plugins/weixinwebauthorization/index/Pay.php b/application/plugins/weixinwebauthorization/index/Pay.php
index 0d7e6f222483323d724c64d23a146fa0ad724e41..ce066ba5ff0e25ba991b632179c9541962297a2e 100644
--- a/application/plugins/weixinwebauthorization/index/Pay.php
+++ b/application/plugins/weixinwebauthorization/index/Pay.php
@@ -31,12 +31,12 @@ class Pay extends Controller
      */
     public function Index($params = [])
     {
-        if(!empty($params['pay_data']))
+        $pay_data = session('weixin_pay_data');
+        $weixin_redirect_url = session('weixin_redirect_url');
+        if(!empty($pay_data))
         {
-            $pay_data = json_decode(base64_decode(urldecode($params['pay_data'])), true);
-            $redirect_url = empty($params['redirect_url']) ? '' : urldecode($params['redirect_url']);
             $this->assign('pay_data', $pay_data);
-            $this->assign('redirect_url', $redirect_url);
+            $this->assign('redirect_url', $weixin_redirect_url);
             return $this->fetch('../../../plugins/view/weixinwebauthorization/index/pay/index');
         } else {
             $this->assign('msg', '支付参数错误');
diff --git a/extend/payment/Weixin.php b/extend/payment/Weixin.php
index 83f59c97fbb0eef35c03accd043cb6a93e0a3ae5..81cefedee8d4dd8bc4db341872543ea2e7d06407 100755
--- a/extend/payment/Weixin.php
+++ b/extend/payment/Weixin.php
@@ -210,7 +210,9 @@ class Weixin
                 // 微信中
                 if(!empty($_SERVER['HTTP_USER_AGENT']) && stripos($_SERVER['HTTP_USER_AGENT'], 'MicroMessenger') !== false)
                 {
-                    $url = PluginsHomeUrl('weixinwebauthorization', 'pay', 'index', ['pay_data'=>urlencode(base64_encode(json_encode($pay_data))), 'redirect_url'=>$redirect_url]);
+                    session('weixin_pay_data', $pay_data);
+                    session('weixin_redirect_url', empty($redirect_url) ? '' : urldecode($redirect_url));
+                    $url = PluginsHomeUrl('weixinwebauthorization', 'pay', 'index');
                     $result = DataReturn('success', 0, $url);
                 } else {
                     $result = DataReturn('success', 0, $pay_data);