diff --git a/README.md b/README.md
index adefbf9..2c47e08 100644
--- a/README.md
+++ b/README.md
@@ -137,7 +137,7 @@ go: finding gopkg.in/yaml.v2 v2.2.1
 appledeMacBook-Pro:forest apple$ ./forest  -help
 flag needs an argument: -help
 Usage of ./forest:
-  -dbUrl string
+  -db-url string
         db url for mysql (default "root:123456@tcp(127.0.0.1:3306)/forest?charset=utf8")
   -etcd-dailtimeout int
         etcd dailtimeout (default 5)
diff --git a/forest/forest.go b/forest/forest.go
index 46b38a5..263a993 100644
--- a/forest/forest.go
+++ b/forest/forest.go
@@ -27,7 +27,7 @@ func main() {
 	httpAddress := flag.String("http-address", DefaultHttpAddress, "http address")
 	etcdDialTime := flag.Int64("etcd-dailtimeout", DefaultDialTimeout, "etcd dailtimeout")
 	help := flag.String("help", "", "forest help")
-	dbUrl := flag.String("dbUrl", DefaultDbUrl, "db url for mysql")
+	dbUrl := flag.String("db-url", DefaultDbUrl, "db-url for mysql")
 	flag.Parse()
 	if *help != "" {
 		flag.Usage()