diff --git a/beike/Shop/Services/TotalServices/ShippingService.php b/beike/Shop/Services/TotalServices/ShippingService.php
index f14d1c94..427448c6 100644
--- a/beike/Shop/Services/TotalServices/ShippingService.php
+++ b/beike/Shop/Services/TotalServices/ShippingService.php
@@ -35,9 +35,9 @@ class ShippingService
         $className = "Plugin\\{$pluginCode}\\Bootstrap";
 
         if (!method_exists($className, 'getShippingFee')) {
-            throw new \Exception("请在插件 {$className} 实现方法: public function getShippingFee(\$totalService)");
+            throw new \Exception("请在插件 {$className} 实现方法: public function getShippingFee(CheckoutService \$checkout)");
         }
-        $amount = (float)(new $className)->getShippingFee($totalService);
+        $amount = (float)(new $className)->getShippingFee($checkout);
         $totalData = [
             'code' => 'shipping',
             'title' => trans('shop/carts.shipping_fee'),
diff --git a/plugins/FlatShipping/Bootstrap.php b/plugins/FlatShipping/Bootstrap.php
index 7bd3ae9e..58b9c3fc 100644
--- a/plugins/FlatShipping/Bootstrap.php
+++ b/plugins/FlatShipping/Bootstrap.php
@@ -41,11 +41,12 @@ class Bootstrap
     /**
      * 计算固定运费
      *
-     * @param $totalService
+     * @param CheckoutService $checkout
      * @return float|int
      */
-    public function getShippingFee($totalService): float|int
+    public function getShippingFee(CheckoutService $checkout): float|int
     {
+        $totalService = $checkout->totalService;
         $amount = $totalService->amount;
         $shippingType = plugin_setting('flat_shipping.type', 'fixed');
         $shippingValue = plugin_setting('flat_shipping.value', 0);