diff --git a/storage/dao/stringx.go b/storage/dao/stringx.go
index 21cadf9..87de94a 100644
--- a/storage/dao/stringx.go
+++ b/storage/dao/stringx.go
@@ -147,19 +147,28 @@ func (d *Dao) GetRange(key *proto.BaseKey, start, end int32) (*proto.GetRangeRes
 
 func (d *Dao) GetSet(key *proto.BaseKey, value string) (*proto.GetSetResponse, error) {
 	val, ok := d.lru.Get(key)
+
+	var oldValue string
+
 	if !ok {
-		return nil, errorx.NotKeyErr(key.Key)
+		oldValue = ""
+		strValue := stringx.NewStringSingle()
+		strValue.Set(value)
+		err := d.lru.Add(key, strValue)
+		if err != nil {
+			return nil, err
+		}
+
+	} else {
+		strVal, ok := val.(structure.StringXInterface)
+		if !ok {
+			return nil, errorx.DaoTypeErr("stringx")
+		}
+		oldValue = strVal.Get()
+		_, updateLength := strVal.Set(value)
+		d.lru.UpdateLruSize(updateLength)
 	}
 
-	strVal, ok := val.(structure.StringXInterface)
-	if !ok {
-		return nil, errorx.DaoTypeErr("stringx")
-	}
-
-	oldValue := strVal.Get()
-
-	_, updateLength := strVal.Set(value)
-	d.lru.UpdateLruSize(updateLength)
 	return &proto.GetSetResponse{Result: oldValue}, nil
 }