diff --git a/app/Service/Api/Coupon/CouponListService.php b/app/Service/Api/Coupon/CouponListService.php
index 06c7593..4bb2ed1 100644
--- a/app/Service/Api/Coupon/CouponListService.php
+++ b/app/Service/Api/Coupon/CouponListService.php
@@ -35,7 +35,7 @@ class CouponListService extends BaseService
      */
     public function handle(): array
     {
-        $limit = $this->request->input('limit',20);
+        $limit = (int)$this->request->input('limit',20);
 
         $data = $this->couponTemplateModel
             ->join('user_coupon', function ($join) {
diff --git a/app/Service/ServiceTrait/Api/OrderTrait.php b/app/Service/ServiceTrait/Api/OrderTrait.php
index ec6f15c..6c59fdc 100644
--- a/app/Service/ServiceTrait/Api/OrderTrait.php
+++ b/app/Service/ServiceTrait/Api/OrderTrait.php
@@ -390,20 +390,33 @@ trait OrderTrait
         if ($this->couponId <= 0 || empty($this->orderRes['coupon']) || $this->orderRes['coupon_id'] <= 0) return;
 
         if ($this->orderRes['coupon']['amount'] <= 0 && $this->orderRes['coupon']['coupon_type'] != CouponCode::COUPON_TYPE_INSTANT_REDUCTION) {
-            $orderMaxPrice = max(array_column($this->orderRes['good'],'price'));
+//            $orderMaxPrice = max(array_column($this->orderRes['good'],'price'));
             $this->orderRes['coupon']['amount'] = match ($this->orderRes['coupon']['coupon_type']) {
                 CouponCode::COUPON_TYPE_INSTANT_REDUCTION => $this->orderRes['coupon']['amount'],
-                CouponCode::COUPON_TYPE_DISCOUNT => bcmul(bcdiv(bcsub("100",(string)$this->orderRes['coupon']['ratio'],2),"100",2),$orderMaxPrice,2),
+                CouponCode::COUPON_TYPE_DISCOUNT => bcmul(
+                    bcdiv(
+                        bcsub(
+                            "100",
+                            (string)$this->orderRes['coupon']['ratio'],
+                            2
+                        ),
+                        "100",
+                        2
+                    ),
+                    max(array_column($this->orderRes['good'],'price')),
+                    2
+                ),
                 default => 0
             };
         }
 
-        $this->orderRes['favorable_good_price'] = $this->orderRes['coupon']['amount'];
+        $this->orderRes['favorable_good_price'] = $this->orderRes['coupon']['coupon_type'] == CouponCode::COUPON_TYPE_INSTANT_REDUCTION ?
+            min($this->orderRes['coupon']['amount'], $this->orderRes['good_after_discount_price']) :
+            $this->orderRes['coupon']['amount'];
         $this->orderRes['good_after_discount_price'] = bcsub($this->orderRes['good_after_discount_price'],$this->orderRes['favorable_good_price'],2);
         $this->orderRes['actual_price'] = bcsub($this->orderRes['actual_price'],$this->orderRes['favorable_good_price'],2);
     }
 
-
     /**
      * @return void
      */