diff --git a/rule/self_buy_global.go b/rule/self_buy_global.go
index 363c4c0..5039432 100644
--- a/rule/self_buy_global.go
+++ b/rule/self_buy_global.go
@@ -50,7 +50,7 @@ func AddOrder(eg *xorm.Engine, req map[string]string) {
 			}
 			nowMoney := leave + price*capitalPoolMul
 			nowNum := int(nowMoney / onemoney)
-			max.Num += nowNum
+			max.Num = nowNum
 			max.LeavePrice = zhios_order_relate_utils.Float64ToStrByPrec(zhios_order_relate_utils.StrToFloat64(max.LeavePrice)+zhios_order_relate_utils.StrToFloat64(req["price"]), 3)
 			max.OtherPrice = zhios_order_relate_utils.Float64ToStrByPrec(zhios_order_relate_utils.StrToFloat64(max.OtherPrice)+zhios_order_relate_utils.StrToFloat64(req["price"]), 3)
 			max.UpdateTime = time.Now()