diff --git a/common/group-ratio.go b/common/group-ratio.go
index 416ba037..ef132624 100644
--- a/common/group-ratio.go
+++ b/common/group-ratio.go
@@ -2,6 +2,7 @@ package common
 
 import (
 	"encoding/json"
+	"errors"
 )
 
 var GroupRatio = map[string]float64{
@@ -19,8 +20,14 @@ func GroupRatio2JSONString() string {
 }
 
 func UpdateGroupRatioByJSONString(jsonStr string) error {
-	GroupRatio = make(map[string]float64)
-	return json.Unmarshal([]byte(jsonStr), &GroupRatio)
+	tempGroupRatio := make(map[string]float64)
+	err := json.Unmarshal([]byte(jsonStr), &tempGroupRatio)
+	err = checkGroupRatio(tempGroupRatio)
+	if err != nil {
+		return err
+	}
+	GroupRatio = tempGroupRatio
+	return err
 }
 
 func GetGroupRatio(name string) float64 {
@@ -31,3 +38,12 @@ func GetGroupRatio(name string) float64 {
 	}
 	return ratio
 }
+
+func checkGroupRatio(checkGroupRatio map[string]float64) error {
+	for name, ratio := range checkGroupRatio {
+		if ratio < 0 {
+			return errors.New("group ratio must be greater than 0: " + name)
+		}
+	}
+	return nil
+}