diff --git a/bizcommon/util/util.go b/bizcommon/util/util.go
index eade0f17..ae070e36 100644
--- a/bizcommon/util/util.go
+++ b/bizcommon/util/util.go
@@ -378,7 +378,7 @@ func GetLastLessOrEqualForFloat64(arr []float64, target float64) int {
 type Int64Filter struct {
 	LowerBound *int64  `json:"lower_bound" bson:"lower_bound"`
 	UpperBound *int64  `json:"upper_bound" bson:"upper_bound"`
-	Scale      float64 `json:"scale" bson:"scale"`
+	ScaleCoeff float64 `json:"scale_coeff" bson:"scale_coeff"`
 	Decay      float64 `json:"decay" bson:"decay"`
 	Weight     float64 `json:"weight" bson:"weight"`
 }
@@ -411,7 +411,8 @@ func CreateGaussDecayFunction(name string, filter *Int64Filter, refFilter *Int64
 	}
 	origin := float64(lb+ub) / 2
 	offset := float64(-lb+ub) / 2
-	return elastic.NewGaussDecayFunction().FieldName(name).Origin(origin).Offset(offset).Scale(refFilter.Scale).Decay(refFilter.Decay).Weight(refFilter.Weight)
+	scale := (origin - offset) * refFilter.ScaleCoeff
+	return elastic.NewGaussDecayFunction().FieldName(name).Origin(origin).Offset(offset).Scale(scale).Decay(refFilter.Decay).Weight(refFilter.Weight)
 }
 
 func CreateKeywordScriptScoreFunction(name string, value string, weight float64) *elastic.ScriptFunction {