diff --git a/product.go b/product.go
index 610faac..9342370 100644
--- a/product.go
+++ b/product.go
@@ -21,10 +21,18 @@ const (
 	StockStateDecrease StockState = "reduce_inventory"   //减少库存
 )
 
+type ProductsChangeStockType = int
+
+const (
+	ProductsChangeStockTypePaied ProductsChangeStockType = 10 // 已支付
+	ProductsChangeStockTypeSent  ProductsChangeStockType = 20 // 已发货
+)
+
 type ProductsChangeStock struct {
-	OrderId  uint       `json:"order_id"`
-	State    StockState `json:"state"`
-	SkuItems []*SkuItem
+	OrderId                 uint                    `json:"order_id"`
+	State                   StockState              `json:"state"`
+	SkuItems                []*SkuItem              `json:"sku_items"`
+	DecreaseChangeStockType ProductsChangeStockType `json:"decrease_change_stock_type"`
 }
 
 type SkuItem struct {