diff --git a/config.example.yml b/config.example.yml
new file mode 100644
index 0000000..66cd4b2
--- /dev/null
+++ b/config.example.yml
@@ -0,0 +1,26 @@
+# debug / info / warning / error / silent
+loglevel: debug
+
+# URL format: [protocol://]host[:port]
+proxy: direct://
+
+# URL format: [driver://]name
+device: tun://tun0
+
+# Maximum transmission unit for each packet
+mtu: 1500
+
+# Network interface to bind, Linux/macOS only
+interface: eth0
+
+# Timeout for each UDP session, default value: 60 seconds
+udp-timeout: 60
+
+# SO_MARK socket option, Linux only
+fwmark: 0
+
+# Statistic server listen address
+stats: 0.0.0.0:9000
+
+# Statistic server authorization token
+token: secret
diff --git a/engine/engine.go b/engine/engine.go
index 00eda02..2bb0bae 100755
--- a/engine/engine.go
+++ b/engine/engine.go
@@ -11,6 +11,8 @@ import (
 	"github.com/xjasonlyu/tun2socks/proxy"
 	"github.com/xjasonlyu/tun2socks/stats"
 	"github.com/xjasonlyu/tun2socks/tunnel"
+
+	"gopkg.in/yaml.v3"
 )
 
 var _engine = &engine{}
@@ -31,16 +33,17 @@ func Insert(k *Key) {
 }
 
 type Key struct {
-	MTU        int
-	Mark       int
-	UDPTimeout int
-	Proxy      string
-	Stats      string
-	Token      string
-	Device     string
-	LogLevel   string
-	Interface  string
-	Version    bool
+	MTU        int    `yaml:"mtu"`
+	Mark       int    `yaml:"fwmark"`
+	UDPTimeout int    `yaml:"udp-timeout"`
+	Proxy      string `yaml:"proxy"`
+	Stats      string `yaml:"stats"`
+	Token      string `yaml:"token"`
+	Device     string `yaml:"device"`
+	LogLevel   string `yaml:"loglevel"`
+	Interface  string `yaml:"interface"`
+	Config     string `yaml:"-"`
+	Version    bool   `yaml:"-"`
 }
 
 type engine struct {
@@ -62,6 +65,7 @@ func (e *engine) start() error {
 	}
 
 	for _, f := range []func() error{
+		e.setConfig,
 		e.setLogLevel,
 		e.setMark,
 		e.setInterface,
@@ -89,6 +93,18 @@ func (e *engine) insert(k *Key) {
 	e.Key = k
 }
 
+func (e *engine) setConfig() error {
+	if e.Config == "" {
+		return nil
+	}
+
+	data, err := os.ReadFile(e.Config)
+	if err != nil {
+		return err
+	}
+	return yaml.Unmarshal(data, e.Key)
+}
+
 func (e *engine) setLogLevel() error {
 	level, err := log.ParseLevel(e.LogLevel)
 	if err != nil {
diff --git a/go.mod b/go.mod
index 7cabcc4..dd85460 100644
--- a/go.mod
+++ b/go.mod
@@ -17,6 +17,7 @@ require (
 	golang.org/x/sys v0.0.0-20211031064116-611d5d643895
 	golang.org/x/time v0.0.0-20210723032227-1f47c861a9ac
 	golang.zx2c4.com/wireguard v0.0.0-20211030003956-52704c4b9288
+	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
 	gvisor.dev/gvisor v0.0.0-20211029210705-806fa5c3235c
 )
 
@@ -24,5 +25,4 @@ require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/google/btree v1.0.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
 )
diff --git a/go.sum b/go.sum
index fc317a4..2d2eff1 100644
--- a/go.sum
+++ b/go.sum
@@ -45,7 +45,8 @@ golang.zx2c4.com/wireguard v0.0.0-20211030003956-52704c4b9288 h1:v3PAPzkDfgUxCCH
 golang.zx2c4.com/wireguard v0.0.0-20211030003956-52704c4b9288/go.mod h1:RTjaYEQboNk7+2qfPGBotaMEh/5HIvmPZ6DIe10lTqI=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gvisor.dev/gvisor v0.0.0-20211029210705-806fa5c3235c h1:S4L2OVKs48LB9vVbPaiEfRqon+dn0wm3MABd2cyvjkc=
 gvisor.dev/gvisor v0.0.0-20211029210705-806fa5c3235c/go.mod h1:btyTBPTxT8AFMvW7yctFJ2nPCEDWZLpmKQEZ0gG+bbQ=
diff --git a/log/level.go b/log/level.go
index f8f75c7..0b30949 100755
--- a/log/level.go
+++ b/log/level.go
@@ -60,7 +60,7 @@ func ParseLevel(lvl string) (Level, error) {
 		return SilentLevel, nil
 	case "error":
 		return ErrorLevel, nil
-	case "warn":
+	case "warning":
 		return WarnLevel, nil
 	case "info":
 		return InfoLevel, nil
diff --git a/main.go b/main.go
index 8966ee5..fe23e5d 100755
--- a/main.go
+++ b/main.go
@@ -17,9 +17,10 @@ func init() {
 	flag.IntVar(&key.MTU, "mtu", 0, "Set device maximum transmission unit (MTU)")
 	flag.IntVar(&key.UDPTimeout, "udp-timeout", 0, "Set timeout for each UDP session")
 	flag.BoolVar(&key.Version, "version", false, "Show version information and quit")
+	flag.StringVar(&key.Config, "config", "", "YAML format configuration file")
 	flag.StringVar(&key.Device, "device", "", "Use this device [driver://]name")
 	flag.StringVar(&key.Interface, "interface", "", "Use network INTERFACE (Linux/MacOS only)")
-	flag.StringVar(&key.LogLevel, "loglevel", "info", "Log level [debug|info|warn|error|silent]")
+	flag.StringVar(&key.LogLevel, "loglevel", "info", "Log level [debug|info|warning|error|silent]")
 	flag.StringVar(&key.Proxy, "proxy", "", "Use this proxy [protocol://]host[:port]")
 	flag.StringVar(&key.Stats, "stats", "", "HTTP statistic server listen address")
 	flag.StringVar(&key.Token, "token", "", "HTTP statistic server auth token")