diff --git a/internal/logic/public/portal/purchaseLogic.go b/internal/logic/public/portal/purchaseLogic.go
index 2c0cd69..322f94c 100644
--- a/internal/logic/public/portal/purchaseLogic.go
+++ b/internal/logic/public/portal/purchaseLogic.go
@@ -83,6 +83,12 @@ func (l *PurchaseLogic) Purchase(req *types.PortalPurchaseRequest) (resp *types.
 		if couponInfo.Count != 0 && couponInfo.Count <= couponInfo.UsedCount {
 			return nil, errors.Wrapf(xerr.NewErrCode(xerr.CouponInsufficientUsage), "coupon used")
 		}
+		// Check expiration time
+		expireTime := time.Unix(couponInfo.ExpireTime, 0)
+		if time.Now().After(expireTime) {
+			return nil, errors.Wrapf(xerr.NewErrCode(xerr.CouponExpired), "coupon expired")
+		}
+
 		couponSub := tool.StringToInt64Slice(couponInfo.Subscribe)
 		if len(couponSub) > 0 && !tool.Contains(couponSub, req.SubscribeId) {
 			return nil, errors.Wrapf(xerr.NewErrCode(xerr.CouponNotApplicable), "coupon not match")
diff --git a/pkg/xerr/errCode.go b/pkg/xerr/errCode.go
index b708ac4..c9377c4 100644
--- a/pkg/xerr/errCode.go
+++ b/pkg/xerr/errCode.go
@@ -57,6 +57,7 @@ const (
 	CouponAlreadyUsed       uint32 = 50002 // Coupon has already been used
 	CouponNotApplicable     uint32 = 50003 // Coupon does not match the order or conditions
 	CouponInsufficientUsage uint32 = 50004 // Coupon has insufficient remaining uses
+	CouponExpired           uint32 = 50005 // Coupon is expired
 )
 
 // Subscribe
diff --git a/pkg/xerr/errMsg.go b/pkg/xerr/errMsg.go
index f4f73a3..f688854 100644
--- a/pkg/xerr/errMsg.go
+++ b/pkg/xerr/errMsg.go
@@ -46,6 +46,7 @@ func init() {
 		CouponAlreadyUsed:       "Coupon has already been used",
 		CouponNotApplicable:     "Coupon does not match the order or conditions",
 		CouponInsufficientUsage: "Coupon has insufficient remaining uses",
+		CouponExpired:           "Coupon is expired",
 
 		// Subscribe
 		SubscribeExpired:                "Subscribe is expired",