diff --git a/gamesrv/slotspkg/slots/desc/machine_desc.go b/gamesrv/slotspkg/slots/desc/machine_desc.go
index 1ab0b43..0ef0437 100644
--- a/gamesrv/slotspkg/slots/desc/machine_desc.go
+++ b/gamesrv/slotspkg/slots/desc/machine_desc.go
@@ -122,6 +122,18 @@ func (n *MachineDesc) BetChangeList() []float64 {
 	}
 	return lists
 }
+func (n *MachineDesc) GetBetIndexByVal(val float64) []int64 {
+	betChangeListRows, ok := n.Sheet("Bet", "BetChangeList").(map[int64]*structs.BetChangeList)
+	if !ok {
+		panic(errors.ConfigTypeError.ErrorWith(n.Theme, "BetChangeList"))
+	}
+	for _, list := range betChangeListRows {
+		if list.BetChangeList == val {
+			return []int64{list.BetSizeIndex, list.BetLevelIndex}
+		}
+	}
+	return nil
+}
 func (n *MachineDesc) GetVector(choice int64, minRatio, maxRatio float64, isForceWin bool) (int64, []int64) {
 	if vectorIndex := config.GetInt64("slots.vectorIndex"); vectorIndex > 0 {
 		rows := n.DefaultSheet("Vector").([]*structs.Vector)
diff --git a/gamesrv/slotspkg/slots/machine/machine_master_misc.go b/gamesrv/slotspkg/slots/machine/machine_master_misc.go
index 2580bb4..94b7532 100644
--- a/gamesrv/slotspkg/slots/machine/machine_master_misc.go
+++ b/gamesrv/slotspkg/slots/machine/machine_master_misc.go
@@ -45,6 +45,9 @@ func (m *Machine) BaseBets() []int64 {
 func (m *Machine) BetChangeList() []float64 {
 	return m.MachineDesc.BetChangeList()
 }
+func (m *Machine) GetBetIndexByVal(val float64) []int64 {
+	return m.MachineDesc.GetBetIndexByVal(val)
+}
 func (m *Machine) Choice() int64 {
 	if m.UserData().ForceChoice > 0 {
 		return m.UserData().ForceChoice