diff --git a/internal/global/flags.go b/internal/global/flags.go
index a5558db..1f97988 100644
--- a/internal/global/flags.go
+++ b/internal/global/flags.go
@@ -9,10 +9,12 @@ var Flags struct {
 	Path string
 
 	Interface string
+	Debug     bool
 }
 
 func initFlags() {
 	flag.StringVar(&Flags.Path, "config", "Config.yaml", "config path")
 	flag.StringVar(&Flags.Interface, "interface", "", "specify the eth name")
+	flag.BoolVar(&Flags.Debug, "debug", false, "enable debug mode")
 	flag.Parse()
 }
diff --git a/internal/global/log.go b/internal/global/log.go
index 5415340..26be3cf 100644
--- a/internal/global/log.go
+++ b/internal/global/log.go
@@ -11,6 +11,9 @@ import (
 )
 
 func initLog() {
+	if Flags.Debug {
+		Config.Settings.Log.DebugLevel = true
+	}
 	if Config.Settings.Log.DebugLevel {
 		log.SetLevel(log.DebugLevel)
 	}