diff --git a/app/Service/ServiceTrait/Api/OrderTrait.php b/app/Service/ServiceTrait/Api/OrderTrait.php
index 0da14c1..c72abf8 100644
--- a/app/Service/ServiceTrait/Api/OrderTrait.php
+++ b/app/Service/ServiceTrait/Api/OrderTrait.php
@@ -357,7 +357,7 @@ trait OrderTrait
             $orderMaxPrice = max(array_column($this->orderRes['good'],'price'));
             $this->orderRes['coupon_info']['amount'] = match ($this->orderRes['coupon_info']['coupon_type']) {
                 CouponCode::COUPON_TYPE_INSTANT_REDUCTION => $this->orderRes['coupon_info']['amount'],
-                CouponCode::COUPON_TYPE_DISCOUNT => bcmul(bcsub("1", $this->orderRes['coupon_info']['ratio'],2),$orderMaxPrice,2),
+                CouponCode::COUPON_TYPE_DISCOUNT => bcmul(bcdiv("100", bcsub("100",$this->orderRes['coupon_info']['ratio'],2),2),$orderMaxPrice,2),
                 default => 0
             };
         }