diff --git a/plugin/mcfish/main.go b/plugin/mcfish/main.go
index cde0b25b28..5ecd5ba8ef 100644
--- a/plugin/mcfish/main.go
+++ b/plugin/mcfish/main.go
@@ -593,8 +593,8 @@ func (sql *fishdb) refreshStroeInfo() (ok bool, err error) {
 			thingInfo := store{}
 			_ = sql.db.Find("store", &thingInfo, "where Name = '"+name+"'")
 			if thingInfo.Number > 150 {
-				// 通货膨胀
-				thing.Discount = (1000 - 5*(thingInfo.Number-150)) / 10
+				// 商品贬值,价格区间 -50%到0%
+				thing.Discount = 50 + rand.Intn(50)
 			}
 			err = sql.db.Insert("stroeDiscount", &thing)
 			if err != nil {
@@ -826,6 +826,10 @@ func (sql *fishdb) selectCanSalesFishFor(uid int64, sales int) int {
 	if time.Now().Day() != time.Unix(userInfo.Duration, 0).Day() {
 		userInfo.Duration = time.Now().Unix()
 		userInfo.SalesFish = 0
+		err := sql.db.Insert("buff", &userInfo)
+		if err != nil {
+			return residue
+		}
 	}
 	maxSales := 100 - userInfo.SalesFish
 	if maxSales < 0 {