diff --git a/cmd/main.go b/cmd/main.go
index 6f65f09..d0ac2e2 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -1,110 +1,94 @@
 package main
 
 import (
-	"flag"
 	"fmt"
-	nested "github.com/antonfisher/nested-logrus-formatter"
-	"github.com/sirupsen/logrus"
-	"github.com/yosuke-furukawa/json5/encoding/json5"
 	"io/ioutil"
 	"os"
 	"strings"
+	"time"
+
+	nested "github.com/antonfisher/nested-logrus-formatter"
+	"github.com/sirupsen/logrus"
+	"github.com/yosuke-furukawa/json5/encoding/json5"
+
+	"github.com/urfave/cli/v2"
 )
 
-// Injected when compiling
 var (
 	appVersion = "Unknown"
 	appCommit  = "Unknown"
 	appDate    = "Unknown"
 )
 
-var (
-	configPath         = flag.String("config", "config.json", "Config file")
-	showVersion        = flag.Bool("version", false, "Show version")
-	disableUpdateCheck = flag.Bool("no-check", false, "Disable update check")
-)
-
-func init() {
-	logrus.SetOutput(os.Stdout)
-
-	lvl, err := logrus.ParseLevel(os.Getenv("LOGGING_LEVEL"))
-	if err == nil {
-		logrus.SetLevel(lvl)
-	} else {
-		logrus.SetLevel(logrus.DebugLevel)
-	}
-
-	// tsFormat is used to format the log timestamp, by default(empty)
-	// the RFC3339("2006-01-02T15:04:05Z07:00") format is used.
-	// The user can use environment variable to override the default
-	// timestamp format(e.g. "2006-01-02 15:04:05").
-	tsFormat := os.Getenv("LOGGING_TIMESTAMP_FORMAT")
-
-	fmtter := os.Getenv("LOGGING_FORMATTER")
-	if strings.ToLower(fmtter) == "json" {
-		logrus.SetFormatter(&logrus.JSONFormatter{
-			TimestampFormat: tsFormat,
-		})
-	} else {
-		logrus.SetFormatter(&nested.Formatter{
-			FieldsOrder: []string{
-				"version", "url",
-				"config", "file", "mode",
-				"addr", "src", "dst", "session", "action",
-				"error",
+func main() {
+	app := &cli.App{
+		Name:                 "Hysteria",
+		Usage:                "a TCP/UDP relay & SOCKS5/HTTP proxy tool optimized for poor network environments",
+		Version:              fmt.Sprintf("%s %s %s", appVersion, appDate, appCommit),
+		Authors:              []*cli.Author{{Name: "HyNetwork <https://github.com/HyNetwork>"}},
+		EnableBashCompletion: true,
+		Action:               clientAction,
+		Flags:                commonFlags(),
+		Before:               initApp,
+		Commands: []*cli.Command{
+			{
+				Name:   "server",
+				Usage:  "Run as server mode",
+				Action: serverAction,
 			},
-			TimestampFormat: tsFormat,
-		})
+			{
+				Name:   "client",
+				Usage:  "Run as client mode",
+				Action: clientAction,
+			},
+		},
+	}
+
+	err := app.Run(os.Args)
+	if err != nil {
+		logrus.Fatal(err)
 	}
 
-	flag.Parse()
 }
 
-func main() {
-	if *showVersion {
-		// Print version and quit
-		fmt.Printf("%-10s%s\n", "Version:", appVersion)
-		fmt.Printf("%-10s%s\n", "Commit:", appCommit)
-		fmt.Printf("%-10s%s\n", "Date:", appDate)
-		return
-	}
-	if !*disableUpdateCheck {
-		go checkUpdate()
-	}
-	cb, err := ioutil.ReadFile(*configPath)
+func clientAction(c *cli.Context) error {
+	cbs, err := ioutil.ReadFile(c.String("config"))
 	if err != nil {
 		logrus.WithFields(logrus.Fields{
-			"file":  *configPath,
+			"file":  c.String("config"),
 			"error": err,
 		}).Fatal("Failed to read configuration")
 	}
-	mode := flag.Arg(0)
-	if strings.EqualFold(mode, "server") {
-		// server mode
-		c, err := parseServerConfig(cb)
-		if err != nil {
-			logrus.WithFields(logrus.Fields{
-				"file":  *configPath,
-				"error": err,
-			}).Fatal("Failed to parse server configuration")
-		}
-		server(c)
-	} else if len(mode) == 0 || strings.EqualFold(mode, "client") {
-		// client mode
-		c, err := parseClientConfig(cb)
-		if err != nil {
-			logrus.WithFields(logrus.Fields{
-				"file":  *configPath,
-				"error": err,
-			}).Fatal("Failed to parse client configuration")
-		}
-		client(c)
-	} else {
-		// invalid
-		fmt.Println()
-		fmt.Printf("Usage: %s MODE [OPTIONS]\n\n"+
-			"Available modes: server, client\n\n", os.Args[0])
+	// client mode
+	cc, err := parseClientConfig(cbs)
+	if err != nil {
+		logrus.WithFields(logrus.Fields{
+			"file":  c.String("config"),
+			"error": err,
+		}).Fatal("Failed to parse client configuration")
 	}
+	client(cc)
+	return nil
+}
+
+func serverAction(c *cli.Context) error {
+	cbs, err := ioutil.ReadFile(c.String("config"))
+	if err != nil {
+		logrus.WithFields(logrus.Fields{
+			"file":  c.String("config"),
+			"error": err,
+		}).Fatal("Failed to read configuration")
+	}
+	// server mode
+	sc, err := parseServerConfig(cbs)
+	if err != nil {
+		logrus.WithFields(logrus.Fields{
+			"file":  c.String("config"),
+			"error": err,
+		}).Fatal("Failed to parse server configuration")
+	}
+	server(sc)
+	return nil
 }
 
 func parseServerConfig(cb []byte) (*serverConfig, error) {
@@ -124,3 +108,71 @@ func parseClientConfig(cb []byte) (*clientConfig, error) {
 	}
 	return &c, c.Check()
 }
+
+func initApp(c *cli.Context) error {
+	logrus.SetOutput(os.Stdout)
+
+	lvl, err := logrus.ParseLevel(c.String("log-level"))
+	if err == nil {
+		logrus.SetLevel(lvl)
+	} else {
+		logrus.SetLevel(logrus.InfoLevel)
+	}
+
+	if strings.ToLower(c.String("log-format")) == "json" {
+		logrus.SetFormatter(&logrus.JSONFormatter{
+			TimestampFormat: c.String("log-timestamp"),
+		})
+	} else {
+		logrus.SetFormatter(&nested.Formatter{
+			FieldsOrder: []string{
+				"version", "url",
+				"config", "file", "mode",
+				"addr", "src", "dst", "session", "action",
+				"error",
+			},
+			TimestampFormat: c.String("log-timestamp"),
+		})
+	}
+
+	if !c.Bool("no-check") {
+		go checkUpdate()
+	}
+
+	return nil
+}
+
+func commonFlags() []cli.Flag {
+	return []cli.Flag{
+		&cli.StringFlag{
+			Name:    "config",
+			Aliases: []string{"c"},
+			Usage:   "config file",
+			EnvVars: []string{"HYSTERIA_CONFIG"},
+			Value:   "./config.json",
+		},
+		&cli.StringFlag{
+			Name:    "log-level",
+			Usage:   "log level",
+			EnvVars: []string{"HYSTERIA_LOG_LEVEL", "LOGGING_LEVEL"},
+			Value:   "info",
+		},
+		&cli.StringFlag{
+			Name:    "log-timestamp",
+			Usage:   "log timestamp format",
+			EnvVars: []string{"HYSTERIA_LOG_TIMESTAMP", "LOGGING_TIMESTAMP_FORMAT"},
+			Value:   time.RFC3339,
+		},
+		&cli.StringFlag{
+			Name:    "log-format",
+			Usage:   "log output format",
+			EnvVars: []string{"HYSTERIA_LOG_FORMAT", "LOGGING_FORMATTER"},
+			Value:   "txt",
+		},
+		&cli.BoolFlag{
+			Name:    "no-check",
+			Usage:   "disable update check",
+			EnvVars: []string{"HYSTERIA_CHECK_UPDATE"},
+		},
+	}
+}
diff --git a/cmd/update.go b/cmd/update.go
index ba3b7bb..9c03ee6 100644
--- a/cmd/update.go
+++ b/cmd/update.go
@@ -2,10 +2,11 @@ package main
 
 import (
 	"encoding/json"
-	"github.com/sirupsen/logrus"
 	"io/ioutil"
 	"net/http"
 	"time"
+
+	"github.com/sirupsen/logrus"
 )
 
 const githubAPIURL = "https://api.github.com/repos/HyNetwork/hysteria/releases/latest"
diff --git a/go.mod b/go.mod
index 9bb464f..c5c9985 100644
--- a/go.mod
+++ b/go.mod
@@ -6,6 +6,7 @@ require (
 	github.com/LiamHaworth/go-tproxy v0.0.0-20190726054950-ef7efd7f24ed
 	github.com/antonfisher/nested-logrus-formatter v1.3.1
 	github.com/caddyserver/certmagic v0.13.1
+	github.com/cpuguy83/go-md2man/v2 v2.0.0 // indirect
 	github.com/elazarl/goproxy v0.0.0-20210110162100-a92cc753f88e
 	github.com/elazarl/goproxy/ext v0.0.0-20210110162100-a92cc753f88e
 	github.com/hashicorp/golang-lru v0.5.4
@@ -13,10 +14,12 @@ require (
 	github.com/lunixbochs/struc v0.0.0-20200707160740-784aaebc1d40
 	github.com/patrickmn/go-cache v2.1.0+incompatible // indirect
 	github.com/prometheus/client_golang v1.10.0
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/sirupsen/logrus v1.8.1
 	github.com/txthinking/runnergroup v0.0.0-20210326110939-37fc67d0da7c // indirect
 	github.com/txthinking/socks5 v0.0.0-20210326104807-61b5745ff346
 	github.com/txthinking/x v0.0.0-20210326105829-476fab902fbe // indirect
+	github.com/urfave/cli/v2 v2.3.0
 	github.com/yosuke-furukawa/json5 v0.1.1
 	golang.org/x/sys v0.0.0-20210426230700-d19ff857e887 // indirect
 )
diff --git a/go.sum b/go.sum
index f9bbda3..22f2641 100644
--- a/go.sum
+++ b/go.sum
@@ -58,6 +58,8 @@ github.com/coreos/go-systemd v0.0.0-20180511133405-39ca1b05acc7/go.mod h1:F5haX7
 github.com/coreos/go-systemd v0.0.0-20181012123002-c6f51f82210d/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/pkg v0.0.0-20160727233714-3ac0863d7acf/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
 github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
+github.com/cpuguy83/go-md2man/v2 v2.0.0 h1:EoUDS0afbrsXAZ9YQ9jdu/mZ2sXgT1/2yyNng4PGlyM=
+github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
@@ -321,8 +323,11 @@ github.com/rcrowley/go-metrics v0.0.0-20181016184325-3113b8401b8a/go.mod h1:bCqn
 github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6SoW27p1b0cqNHllgS5HIMJraePCO15w5zCzIWYg=
 github.com/rogpeppe/go-charset v0.0.0-20180617210344-2471d30d28b4/go.mod h1:qgYeAmZ5ZIpBWTGllZSQnw97Dj+woV0toclVaRGI8pc=
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
+github.com/russross/blackfriday v1.5.2 h1:HyvC0ARfnZBqnXwABFeSZHpKvJHJJfPz81GNueLj0oo=
 github.com/russross/blackfriday v1.5.2/go.mod h1:JO/DiYxRf+HjHt06OyowR9PTA263kcR/rfWxYHBV53g=
 github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/ryanuber/columnize v0.0.0-20160712163229-9b3edd62028f/go.mod h1:sm1tb6uqfes/u+d4ooFouqFdy9/2g9QGwK3SQygK0Ts=
 github.com/samuel/go-zookeeper v0.0.0-20190923202752-2cc03de413da/go.mod h1:gi+0XIa01GRL2eRQVjQkKGqKF3SF9vZR/HnPullcV2E=
 github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529/go.mod h1:DxrIzT+xaE7yg65j358z/aeFdxmN0P9QXhEzd20vsDc=
@@ -383,7 +388,10 @@ github.com/txthinking/socks5 v0.0.0-20210326104807-61b5745ff346/go.mod h1:d3n8NJ
 github.com/txthinking/x v0.0.0-20210326105829-476fab902fbe h1:gMWxZxBFRAXqoGkwkYlPX2zvyyKNWJpxOxCrjqJkm5A=
 github.com/txthinking/x v0.0.0-20210326105829-476fab902fbe/go.mod h1:WgqbSEmUYSjEV3B1qmee/PpP2NYEz4bL9/+mF1ma+s4=
 github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
+github.com/urfave/cli v1.22.1 h1:+mkCCcOFKPnCmVYVcURKps1Xe+3zP90gSYGNfRkjoIY=
 github.com/urfave/cli v1.22.1/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
+github.com/urfave/cli/v2 v2.3.0 h1:qph92Y649prgesehzOrQjdWyxFOp/QVM+6imKHad91M=
+github.com/urfave/cli/v2 v2.3.0/go.mod h1:LJmUH05zAU44vOAcrfzZQKsZbVcdbOG8rtL3/XcUArI=
 github.com/viant/assertly v0.4.8/go.mod h1:aGifi++jvCrUaklKEKT0BU95igDNaqkvz+49uaYMPRU=
 github.com/viant/toolbox v0.24.0/go.mod h1:OxMCG57V0PXuIP2HNQrtJf2CjqdmbrOx5EkMILuUhzM=
 github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
@@ -585,6 +593,7 @@ gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRN
 gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=