diff --git a/example_test.go b/example_test.go
index 53c2678..dcea2f6 100644
--- a/example_test.go
+++ b/example_test.go
@@ -7,8 +7,8 @@ import (
 	"net"
 	"net/http"
 
+	"github.com/introspection3/socks5"
 	"github.com/miekg/dns"
-	"github.com/txthinking/socks5"
 )
 
 func ExampleServer() {
diff --git a/go.mod b/go.mod
index 5ebb64c..d2ec7bd 100644
--- a/go.mod
+++ b/go.mod
@@ -1,4 +1,4 @@
-module github.com/txthinking/socks5
+module github.com/introspection3/txthinkingsocks5
 
 go 1.16
 
diff --git a/server.go b/server.go
index 8e12af0..c04b188 100644
--- a/server.go
+++ b/server.go
@@ -23,20 +23,20 @@ var (
 
 // Server is socks5 server wrapper
 type Server struct {
-	UserName          string
-	Password          string
-	Method            byte
-	SupportedCommands []byte
-	Addr              string
-	ServerAddr        net.Addr
-	UDPConn           *net.UDPConn
-	UDPExchanges      *cache.Cache
-	TCPTimeout        int
-	UDPTimeout        int
-	Handle            Handler
-	AssociatedUDP     *cache.Cache
-	UDPSrc            *cache.Cache
-	RunnerGroup       *runnergroup.RunnerGroup
+	MethodUsernamePasswordEnabled bool
+	Accounts                      map[string]string
+	Method                        byte
+	SupportedCommands             []byte
+	Addr                          string
+	ServerAddr                    net.Addr
+	UDPConn                       *net.UDPConn
+	UDPExchanges                  *cache.Cache
+	TCPTimeout                    int
+	UDPTimeout                    int
+	Handle                        Handler
+	AssociatedUDP                 *cache.Cache
+	UDPSrc                        *cache.Cache
+	RunnerGroup                   *runnergroup.RunnerGroup
 	// RFC: [UDP ASSOCIATE] The server MAY use this information to limit access to the association. Default false, no limit.
 	LimitUDP bool
 }
@@ -48,7 +48,7 @@ type UDPExchange struct {
 }
 
 // NewClassicServer return a server which allow none method
-func NewClassicServer(addr, ip, username, password string, tcpTimeout, udpTimeout int) (*Server, error) {
+func NewClassicServer(addr, ip string, accounts map[string]string, tcpTimeout, udpTimeout int) (*Server, error) {
 	_, p, err := net.SplitHostPort(addr)
 	if err != nil {
 		return nil, err
@@ -58,25 +58,29 @@ func NewClassicServer(addr, ip, username, password string, tcpTimeout, udpTimeou
 		return nil, err
 	}
 	m := MethodNone
-	if username != "" && password != "" {
+	var methodUsernamePasswordEnabled = false
+	if len(accounts) > 0 {
 		m = MethodUsernamePassword
+		methodUsernamePasswordEnabled = true
+
 	}
 	cs := cache.New(cache.NoExpiration, cache.NoExpiration)
 	cs1 := cache.New(cache.NoExpiration, cache.NoExpiration)
 	cs2 := cache.New(cache.NoExpiration, cache.NoExpiration)
+
 	s := &Server{
-		Method:            m,
-		UserName:          username,
-		Password:          password,
-		SupportedCommands: []byte{CmdConnect, CmdUDP},
-		Addr:              addr,
-		ServerAddr:        saddr,
-		UDPExchanges:      cs,
-		TCPTimeout:        tcpTimeout,
-		UDPTimeout:        udpTimeout,
-		AssociatedUDP:     cs1,
-		UDPSrc:            cs2,
-		RunnerGroup:       runnergroup.New(),
+		Method:                        m,
+		Accounts:                      accounts,
+		MethodUsernamePasswordEnabled: methodUsernamePasswordEnabled,
+		SupportedCommands:             []byte{CmdConnect, CmdUDP},
+		Addr:                          addr,
+		ServerAddr:                    saddr,
+		UDPExchanges:                  cs,
+		TCPTimeout:                    tcpTimeout,
+		UDPTimeout:                    udpTimeout,
+		AssociatedUDP:                 cs1,
+		UDPSrc:                        cs2,
+		RunnerGroup:                   runnergroup.New(),
 	}
 	return s, nil
 }
@@ -107,12 +111,13 @@ func (s *Server) Negotiate(rw io.ReadWriter) error {
 		return err
 	}
 
-	if s.Method == MethodUsernamePassword {
+	if s.MethodUsernamePasswordEnabled {
 		urq, err := NewUserPassNegotiationRequestFrom(rw)
 		if err != nil {
 			return err
 		}
-		if string(urq.Uname) != s.UserName || string(urq.Passwd) != s.Password {
+		v, exist := s.Accounts[string(urq.Uname)]
+		if !exist || string(urq.Passwd) != v {
 			urp := NewUserPassNegotiationReply(UserPassStatusFailure)
 			if _, err := urp.WriteTo(rw); err != nil {
 				return err