diff --git a/platformapi/autonavi/autonavi.go b/platformapi/autonavi/autonavi.go
index c39980f7..3f5647e3 100644
--- a/platformapi/autonavi/autonavi.go
+++ b/platformapi/autonavi/autonavi.go
@@ -69,6 +69,16 @@ const (
 	DistrictLevelStreet   = 4
 )
 
+var (
+	levelStr2IntMap = map[string]int{
+		"country":  DistrictLevelCountry,
+		"province": DistrictLevelProvince,
+		"city":     DistrictLevelCity,
+		"district": DistrictLevelDistrict,
+		"street":   DistrictLevelStreet,
+	}
+)
+
 type District struct {
 	Adcode    string      `json:"adcode"` // 国家行政编码
 	Lng       float64     `json:"lng"`
@@ -233,17 +243,5 @@ func (a *API) getDistrictsFromInterface(districts interface{}) (districtList []*
 }
 
 func GetDistrictLevel(levelName string) (level int) {
-	switch levelName {
-	case "country":
-		level = 0
-	case "province":
-		level = 1
-	case "city":
-		level = 2
-	case "district":
-		level = 3
-	case "street":
-		level = 4
-	}
-	return level
+	return levelStr2IntMap[levelName]
 }