diff --git a/app/admin/models/user.go b/app/admin/models/user.go
index b7d958f..d77400d 100644
--- a/app/admin/models/user.go
+++ b/app/admin/models/user.go
@@ -4220,46 +4220,82 @@ func UpdateExpireUserVm() {
 	for _, record := range userVmRecords {
 		// 计算需要扣除的积分
 		pointsToDeduct := record.Alter - record.UsedVm
+		if pointsToDeduct <= 0 {
+			continue
+		}
 
-		if pointsToDeduct > 0 {
-			// 更新 UserVm 表，防止 vm 变为负值，并更新 updated_at 字段
-			sql := `
+		// 开启事务
+		tx := orm.Eloquent.Begin()
+		if tx.Error != nil {
+			log.Printf("Failed to begin transaction for uid %d: %v", record.Uid, tx.Error)
+			continue
+		}
+
+		// 查询用户当前总积分
+		var currentVm int64
+		err = tx.Table("user_vm").
+			Where("uid = ?", record.Uid).
+			Pluck("vm", &currentVm).Error
+		if err != nil {
+			log.Printf("Failed to get current vm for uid %d: %v", record.Uid, err)
+			tx.Rollback()
+			continue
+		}
+
+		// currentVm 是扣减前积分
+		beforeVm := currentVm
+		afterVm := currentVm - int64(pointsToDeduct)
+		if afterVm < 0 {
+			afterVm = 0
+		}
+
+		// 更新 UserVm 表，防止 vm 变为负值，并更新 updated_at 字段
+		sql := `
 				UPDATE user_vm 
 				SET vm = IF(vm - ? >= 0, vm - ?, 0), updated_at = ?
 				WHERE uid = ?
 			`
-			err = orm.Eloquent.Exec(sql, pointsToDeduct, pointsToDeduct, time.Now(), record.Uid).Error
-			if err != nil {
-				log.Printf("Failed to update user_vm for uid %d: %v", record.Uid, err)
-				continue
-			}
+		err = tx.Exec(sql, pointsToDeduct, pointsToDeduct, time.Now(), record.Uid).Error
+		if err != nil {
+			log.Printf("Failed to update user_vm for uid %d: %v", record.Uid, err)
+			tx.Rollback()
+			continue
+		}
 
-			// 更新原有的 UserVmRecord，更新 used_vm 的值为 alter
-			err = orm.Eloquent.Table("user_vm_record").Where("id=?", record.ID).
-				Updates(map[string]interface{}{
-					"used_vm":    record.Alter,
-					"updated_at": time.Now(),
-				}).Error
-			if err != nil {
-				log.Printf("Failed to update user_vm_record (used_vm) for record id %d: %v", record.ID, err)
-				continue
-			}
+		// 更新原有的 UserVmRecord，更新 used_vm 的值为 alter
+		err = tx.Table("user_vm_record").Where("id=?", record.ID).
+			Updates(map[string]interface{}{
+				"used_vm":    record.Alter,
+				"updated_at": time.Now(),
+			}).Error
+		if err != nil {
+			log.Printf("Failed to update user_vm_record (used_vm) for record id %d: %v", record.ID, err)
+			tx.Rollback()
+			continue
+		}
 
-			// 创建新的 UserVmRecord 记录扣除过期积分
-			newRecord := UserVmRecord{
-				Uid:      record.Uid,
-				BeforeVm: record.AfterVm,
-				AfterVm:  record.AfterVm - uint32(pointsToDeduct),
-				Alter:    -pointsToDeduct,
-				Event:    VmEventExpired,
-				Describe: "积分过期扣减",
-				BillSn:   record.BillSn,
-			}
+		// 创建新的 UserVmRecord 记录扣除过期积分
+		newRecord := UserVmRecord{
+			Uid:      record.Uid,
+			BeforeVm: uint32(beforeVm), // 扣减前的积分
+			AfterVm:  uint32(afterVm),  // 扣减后的积分
+			Alter:    -pointsToDeduct,
+			Event:    VmEventExpired,
+			Describe: "积分过期扣减",
+			BillSn:   record.BillSn,
+		}
 
-			err = orm.Eloquent.Table("user_vm_record").Create(&newRecord).Error
-			if err != nil {
-				log.Printf("Failed to create new user_vm_record for uid %d: %v", record.Uid, err)
-			}
+		err = tx.Table("user_vm_record").Create(&newRecord).Error
+		if err != nil {
+			log.Printf("Failed to create new user_vm_record for uid %d: %v", record.Uid, err)
+			tx.Rollback()
+			continue
+		}
+
+		// 提交事务
+		if err = tx.Commit().Error; err != nil {
+			log.Printf("Failed to commit transaction for uid %d: %v", record.Uid, err)
+			tx.Rollback()
 		}
 	}
 }
diff --git a/app/admin/models/user_vm.go b/app/admin/models/user_vm.go
index 185a9a6..cd8e4a1 100644
--- a/app/admin/models/user_vm.go
+++ b/app/admin/models/user_vm.go
@@ -57,6 +57,21 @@ type UserVmRecord struct {
 }
 
 func UserVmUpdate(gdb *gorm.DB, billSn string, uid uint32, amount int, event, describe string) error {
+	// 仅对零售销售事件做幂等检查
+	var count int64
+	if event == VmEventErpOrderSale {
+		err := orm.Eloquent.Table("user_vm_record").
+			Where("bill_sn = ? AND event = ?", billSn, event).
+			Count(&count).Error
+		if err != nil {
+			return err
+		}
+		if count > 0 {
+			// 已有记录，直接返回
+			return nil
+		}
+	}
+
 	var userVm UserVm
 	err := orm.Eloquent.Table("user_vm").
 		Where("uid=?", uid).Find(&userVm).Error