diff --git a/server/light_backtask/task/stacking_go.go b/server/light_backtask/task/stacking_go.go
index 0fc23abf..762be9b5 100644
--- a/server/light_backtask/task/stacking_go.go
+++ b/server/light_backtask/task/stacking_go.go
@@ -11,6 +11,8 @@ import (
 	"math/big"
 )
 
+const DECIMALS = 18
+
 const (
 	EVENT_NAME_STAKE_CEC = "StakeCec"
 	EVENT_NAME_UNSTAKE_CEC = "UnstakeCec"
@@ -170,7 +172,7 @@ func (this *stackingCec) apply(idx int64, eventName string,
 	if !ok {
 		return false
 	}
-	var growthValueInt64 = bnNewGrowthValue.Int64()
+	var growthValueInt64 = bnNewGrowthValue.Rsh(bnNewGrowthValue, DECIMALS).Int64()
 	bnNewAmount.Add(bnNewAmount, bnAmount)
 	{
 		nowTime := f5.GetApp().GetRealSeconds()