diff --git a/backend/cmd/server/main.go b/backend/cmd/server/main.go
index e23b0bc..fa22b51 100644
--- a/backend/cmd/server/main.go
+++ b/backend/cmd/server/main.go
@@ -2,9 +2,11 @@ package main
 
 import (
 	"log"
+	"time"
 
 	"sale/internal/api/routes"
 	"sale/internal/config"
+	"sale/internal/models"
 	"sale/internal/utils"
 
 	"github.com/gin-gonic/gin"
@@ -21,6 +23,9 @@ func main() {
 		gin.SetMode(gin.ReleaseMode)
 	}
 
+	// 启动订单过期检查定时任务
+	go startOrderExpiryChecker()
+
 	r := gin.Default()
 
 	routes.SetupRoutes(r)
@@ -31,3 +36,63 @@ func main() {
 		log.Fatalf("Failed to start server: %v", err)
 	}
 }
+
+// startOrderExpiryChecker 启动定时检查过期订单
+func startOrderExpiryChecker() {
+	ticker := time.NewTicker(30 * time.Second)
+	defer ticker.Stop()
+
+	// 立即执行一次
+	checkExpiredOrders()
+
+	for range ticker.C {
+		checkExpiredOrders()
+	}
+}
+
+// checkExpiredOrders 检查并更新过期订单状态
+func checkExpiredOrders() {
+	now := time.Now()
+
+	// 查找所有已过期但状态仍为待支付的订单
+	var orders []models.Order
+	if err := utils.DB.Where("status = ? AND payment_expires_at IS NOT NULL AND payment_expires_at < ?",
+		models.OrderStatusPendingPayment, now).Find(&orders).Error; err != nil {
+		log.Printf("[OrderExpiry] Failed to query expired orders: %v", err)
+		return
+	}
+
+	if len(orders) == 0 {
+		return
+	}
+
+	log.Printf("[OrderExpiry] Found %d expired orders", len(orders))
+
+	for _, order := range orders {
+		tx := utils.DB.Begin()
+
+		// 更新订单状态为已取消
+		if err := tx.Model(&order).Update("status", models.OrderStatusCancelled).Error; err != nil {
+			tx.Rollback()
+			log.Printf("[OrderExpiry] Failed to cancel order %d: %v", order.ID, err)
+			continue
+		}
+
+		// 恢复库存
+		var orderItems []models.OrderItem
+		if err := tx.Where("order_id = ?", order.ID).Find(&orderItems).Error; err != nil {
+			tx.Rollback()
+			continue
+		}
+
+		for _, item := range orderItems {
+			var inventory models.Inventory
+			if err := tx.Where("product_id = ?", item.ProductID).First(&inventory).Error; err == nil {
+				tx.Model(&inventory).UpdateColumn("quantity", inventory.Quantity+item.Quantity)
+			}
+		}
+
+		tx.Commit()
+		log.Printf("[OrderExpiry] Order %d cancelled, stock restored", order.ID)
+	}
+}