diff --git a/config/config.go b/config/config.go
index b3f8bf2..e74bc1c 100644
--- a/config/config.go
+++ b/config/config.go
@@ -8,14 +8,14 @@ const (
 	FlagPidFilePathName       = "pid-path"
 )
 
-func FlagConfigDir() *string {
-	return flag.String(FlagConfigDirName, "./config.json", "The directory path of config")
+func FlagConfigDir(defaultValue string) *string {
+	return flag.String(FlagConfigDirName, defaultValue, "The directory path of config")
 }
 
-func FlagLogConfigFilePath() *string {
-	return flag.String(FlagLogConfigFilePathName, "", "The file path of logging config")
+func FlagLogConfigFilePath(defaultValue string) *string {
+	return flag.String(FlagLogConfigFilePathName, defaultValue, "The file path of logging config")
 }
 
-func FlagPidFilePath() *string {
-	return flag.String(FlagPidFilePathName, "./pid.pid", "The file path of pid")
+func FlagPidFilePath(defaultValue string) *string {
+	return flag.String(FlagPidFilePathName, defaultValue, "The file path of pid")
 }