diff --git a/cli/ss-server/config.json b/cli/ss-server/config.json
index 96fb883..63169a5 100644
--- a/cli/ss-server/config.json
+++ b/cli/ss-server/config.json
@@ -2,5 +2,6 @@
   "server": "::",
   "server_port": 8080,
   "method": "2022-blake3-aes-128-gcm",
-  "key": "psk"
+  "key": "psk",
+  "log_level": "warn"
 }
\ No newline at end of file
diff --git a/cli/ss-server/main.go b/cli/ss-server/main.go
index eff9339..c092704 100644
--- a/cli/ss-server/main.go
+++ b/cli/ss-server/main.go
@@ -9,7 +9,6 @@ import (
 	"net/netip"
 	"os"
 	"os/signal"
-	"strings"
 	"syscall"
 
 	"github.com/sagernet/sing"
@@ -41,54 +40,55 @@ type flags struct {
 	Password   string `json:"password"`
 	Key        string `json:"key"`
 	Method     string `json:"method"`
-	Verbose    bool   `json:"verbose"`
-	ConfigFile string
+	LogLevel   string `json:"log_level"`
 }
 
+var configPath string
+
 func main() {
-	f := new(flags)
-
 	command := &cobra.Command{
-		Use:     "ss-local",
-		Short:   "shadowsocks client",
+		Use:     "ss-server [-c config.json]",
+		Short:   "shadowsocks server",
 		Version: sing.VersionStr,
-		Run: func(cmd *cobra.Command, args []string) {
-			run(cmd, f)
-		},
+		Run:     run,
 	}
-
-	command.Flags().StringVarP(&f.Server, "server", "s", "", "Set the server’s hostname or IP.")
-	command.Flags().Uint16VarP(&f.ServerPort, "server-port", "p", 0, "Set the server’s port number.")
-	command.Flags().StringVarP(&f.Bind, "local-address", "b", "", "Set the local address.")
-	command.Flags().Uint16VarP(&f.LocalPort, "local-port", "l", 0, "Set the local port number.")
-	command.Flags().StringVar(&f.Key, "key", "", "Set the key directly. The key should be encoded with URL-safe Base64.")
-	command.Flags().StringVarP(&f.Password, "password", "k", "", "Set the password. The server and the client should use the same password.")
-
-	var supportedCiphers []string
-	supportedCiphers = append(supportedCiphers, shadowsocks.MethodNone)
-	supportedCiphers = append(supportedCiphers, shadowaead.List...)
-	supportedCiphers = append(supportedCiphers, shadowaead_2022.List...)
-
-	command.Flags().StringVarP(&f.Method, "encrypt-method", "m", "", "Set the cipher.\n\nSupported ciphers:\n\n"+strings.Join(supportedCiphers, "\n"))
-	command.Flags().StringVarP(&f.ConfigFile, "config", "c", "", "Use a configuration file.")
-	command.Flags().BoolVarP(&f.Verbose, "verbose", "v", false, "Enable verbose mode.")
-
+	command.Flags().StringVarP(&configPath, "config", "c", "", "set a configuration file")
 	err := command.Execute()
 	if err != nil {
 		logrus.Fatal(err)
 	}
 }
 
-func run(cmd *cobra.Command, f *flags) {
+func run(cmd *cobra.Command, args []string) {
+	if configPath == "" {
+		configPath = "config.json"
+	}
+
+	configFile, err := ioutil.ReadFile(configPath)
+	if err != nil {
+		logrus.Fatal(E.Cause(err, "read config file"))
+	}
+
+	f := new(flags)
+	err = json.Unmarshal(configFile, f)
+	if err != nil {
+		logrus.Fatal(E.Cause(err, "parse config file"))
+	}
+
+	if f.LogLevel != "" {
+		level, err := logrus.ParseLevel(f.LogLevel)
+		if err != nil {
+			logrus.Fatal("unknown log level ", f.LogLevel)
+		}
+		logrus.SetLevel(level)
+	}
+
 	s, err := newServer(f)
 	if err != nil {
 		logrus.Fatal(err)
 	}
-	err = s.tcpIn.Start()
-	if err != nil {
-		logrus.Fatal(err)
-	}
-	err = s.udpIn.Start()
+
+	err = s.Start()
 	if err != nil {
 		logrus.Fatal(err)
 	}
@@ -98,8 +98,7 @@ func run(cmd *cobra.Command, f *flags) {
 	signal.Notify(osSignals, os.Interrupt, syscall.SIGTERM)
 	<-osSignals
 
-	s.tcpIn.Close()
-	s.udpIn.Close()
+	s.Close()
 }
 
 type server struct {
@@ -126,46 +125,6 @@ func (s *server) Close() error {
 func newServer(f *flags) (*server, error) {
 	s := new(server)
 
-	if f.ConfigFile != "" {
-		configFile, err := ioutil.ReadFile(f.ConfigFile)
-		if err != nil {
-			return nil, E.Cause(err, "read config file")
-		}
-		flagsNew := new(flags)
-		err = json.Unmarshal(configFile, flagsNew)
-		if err != nil {
-			return nil, E.Cause(err, "decode config file")
-		}
-		if flagsNew.Server != "" && f.Server == "" {
-			f.Server = flagsNew.Server
-		}
-		if flagsNew.ServerPort != 0 && f.ServerPort == 0 {
-			f.ServerPort = flagsNew.ServerPort
-		}
-		if flagsNew.Bind != "" && f.Bind == "" {
-			f.Bind = flagsNew.Bind
-		}
-		if flagsNew.LocalPort != 0 && f.LocalPort == 0 {
-			f.LocalPort = flagsNew.LocalPort
-		}
-		if flagsNew.Password != "" && f.Password == "" {
-			f.Password = flagsNew.Password
-		}
-		if flagsNew.Key != "" && f.Key == "" {
-			f.Key = flagsNew.Key
-		}
-		if flagsNew.Method != "" && f.Method == "" {
-			f.Method = flagsNew.Method
-		}
-		if flagsNew.Verbose {
-			f.Verbose = true
-		}
-	}
-
-	if f.Verbose {
-		logrus.SetLevel(logrus.TraceLevel)
-	}
-
 	if f.Server == "" {
 		return nil, E.New("missing server address")
 	} else if f.ServerPort == 0 {