diff --git a/common/group-ratio.go b/common/group-ratio.go
index 0a9cf4b..b9efbda 100644
--- a/common/group-ratio.go
+++ b/common/group-ratio.go
@@ -17,6 +17,7 @@ func GroupRatio2JSONString() string {
 }
 
 func UpdateGroupRatioByJSONString(jsonStr string) error {
+	GroupRatio = make(map[string]float64)
 	return json.Unmarshal([]byte(jsonStr), &GroupRatio)
 }
 
diff --git a/common/model-ratio.go b/common/model-ratio.go
index bc7e7be..fc98249 100644
--- a/common/model-ratio.go
+++ b/common/model-ratio.go
@@ -39,6 +39,7 @@ func ModelRatio2JSONString() string {
 }
 
 func UpdateModelRatioByJSONString(jsonStr string) error {
+	ModelRatio = make(map[string]float64)
 	return json.Unmarshal([]byte(jsonStr), &ModelRatio)
 }