diff --git a/chain.go b/chain.go
index f4dc6dd..f2a5eb0 100644
--- a/chain.go
+++ b/chain.go
@@ -556,3 +556,7 @@ func (c *ProxyChain) getQuicConn(header http.Header) (net.Conn, error) {
 	conn.remoteAddr, _ = net.ResolveUDPAddr("udp", quicNode.Addr)
 	return conn, nil
 }
+
+type Chain struct {
+	nodes []Node
+}
diff --git a/client.go b/client.go
new file mode 100644
index 0000000..e43cfea
--- /dev/null
+++ b/client.go
@@ -0,0 +1,10 @@
+package gost
+
+import "net"
+
+// Client represents a node client
+type Client interface {
+	Connect() (net.Conn, error)
+	Handshake(conn net.Conn) (net.Conn, error)
+	Dial(conn net.Conn, addr string) (net.Conn, error)
+}
diff --git a/node.go b/node.go
index bc22387..26b4fdf 100644
--- a/node.go
+++ b/node.go
@@ -211,3 +211,11 @@ func (node *ProxyNode) keyFile() string {
 func (node ProxyNode) String() string {
 	return fmt.Sprintf("transport: %s, protocol: %s, addr: %s, whitelist: %v, blacklist: %v", node.Transport, node.Protocol, node.Addr, node.Whitelist, node.Blacklist)
 }
+
+// Node represents a proxy node
+type Node interface {
+	Init(opts ...Option) error
+	Client() Client
+	Server() Server
+	Options() Options
+}
diff --git a/options.go b/options.go
new file mode 100644
index 0000000..55bbe16
--- /dev/null
+++ b/options.go
@@ -0,0 +1,77 @@
+package gost
+
+import (
+	"log"
+	"reflect"
+)
+
+// Options holds options of node
+type Options interface {
+	Get(opt string) (v interface{})
+	Set(opt string, v interface{})
+}
+
+type Option func(Options)
+
+type DefaultOptions struct {
+	Addr      string `opt:"addr"`      // [host]:port
+	Protocol  string `opt:"protocol"`  // protocol: http/socks5/ss
+	Transport string `opt:"transport"` // transport: ws/wss/tls/http2/tcp/udp/rtcp/rudp
+}
+
+func (o *DefaultOptions) Get(opt string) interface{} {
+	return GetOption(o, opt)
+}
+
+func (o *DefaultOptions) Set(opt string, v interface{}) {
+	SetOption(o, opt, v)
+}
+
+func AddrOption(a string) Option {
+	return func(opts Options) {
+		SetOption(opts, "addr", a)
+	}
+}
+
+func ProtocolOption(p string) Option {
+	return func(opts Options) {
+		SetOption(opts, "protocol", p)
+	}
+}
+
+func TransportOption(t string) Option {
+	return func(opts Options) {
+		SetOption(opts, "transport", t)
+	}
+}
+
+func GetOption(i interface{}, opt string) interface{} {
+	ps := reflect.ValueOf(i)
+	if ps.Kind() != reflect.Ptr && ps.Kind() != reflect.Interface {
+		return nil
+	}
+	s := ps.Elem()
+	for n := 0; n < s.NumField(); n++ {
+		log.Println("tag:", s.Type().Field(n).Tag.Get("opt"))
+		if opt == s.Type().Field(n).Tag.Get("opt") && s.Field(n).CanInterface() {
+			//	return s.Field(n).Interface()
+		}
+	}
+	return nil
+}
+
+func SetOption(i interface{}, opt string, v interface{}) {
+	ps := reflect.ValueOf(i)
+	if ps.Kind() != reflect.Ptr || ps.Kind() != reflect.Interface {
+		return
+	}
+	s := ps.Elem()
+
+	for n := 0; n < s.NumField(); n++ {
+		if opt == s.Type().Field(n).Tag.Get("opt") &&
+			s.Field(n).IsValid() && s.Field(n).CanSet() {
+			s.Field(n).Set(reflect.ValueOf(v))
+			return
+		}
+	}
+}
diff --git a/server.go b/server.go
index fb73e6c..dfd1aac 100644
--- a/server.go
+++ b/server.go
@@ -295,3 +295,8 @@ func (_ *ProxyServer) transport(conn1, conn2 net.Conn) (err error) {
 
 	return
 }
+
+// Server represents a node server
+type Server interface {
+	Run() error
+}
diff --git a/tcp/client.go b/tcp/client.go
new file mode 100644
index 0000000..5ed219f
--- /dev/null
+++ b/tcp/client.go
@@ -0,0 +1,18 @@
+package tcp
+
+import "net"
+
+type nodeClient struct {
+}
+
+func (c *nodeClient) Connect() (net.Conn, error) {
+	return nil, nil
+}
+
+func (c *nodeClient) Handshake(conn net.Conn) (net.Conn, error) {
+	return conn, nil
+}
+
+func (c *nodeClient) Dial(conn net.Conn, addr string) (net.Conn, error) {
+	return nil, nil
+}
diff --git a/tcp/node.go b/tcp/node.go
new file mode 100644
index 0000000..3bfab96
--- /dev/null
+++ b/tcp/node.go
@@ -0,0 +1,43 @@
+package tcp
+
+import (
+	"github.com/ginuerzh/gost"
+)
+
+type tcpNode struct {
+	options *tcpNodeOptions
+	client  *nodeClient
+	server  *nodeServer
+}
+
+// NewNode creates a tcpNode with options
+func NewNode(opts ...gost.Option) gost.Node {
+	node := &tcpNode{
+		options: new(tcpNodeOptions),
+	}
+	for _, opt := range opts {
+		opt(node.options)
+	}
+
+	return node
+}
+
+func (node *tcpNode) Init(opts ...gost.Option) error {
+	for _, opt := range opts {
+		opt(node.options)
+	}
+
+	return nil
+}
+
+func (node *tcpNode) Client() gost.Client {
+	return node.client
+}
+
+func (node *tcpNode) Server() gost.Server {
+	return node.server
+}
+
+func (node *tcpNode) Options() gost.Options {
+	return node.options
+}
diff --git a/tcp/options.go b/tcp/options.go
new file mode 100644
index 0000000..87918a5
--- /dev/null
+++ b/tcp/options.go
@@ -0,0 +1,26 @@
+package tcp
+
+import (
+	"net/url"
+
+	"github.com/ginuerzh/gost"
+)
+
+type tcpNodeOptions struct {
+	*gost.DefaultOptions
+	Users []url.Userinfo `opt:"users"` // authentication for proxy
+}
+
+func (o *tcpNodeOptions) Get(opt string) interface{} {
+	return gost.GetOption(o, opt)
+}
+
+func (o *tcpNodeOptions) Set(opt string, v interface{}) {
+	gost.SetOption(o, opt, v)
+}
+
+func UsersOption(users ...url.Userinfo) gost.Option {
+	return func(opts gost.Options) {
+		gost.SetOption(opts, "users", users)
+	}
+}
diff --git a/tcp/options_test.go b/tcp/options_test.go
new file mode 100644
index 0000000..ab5bfd5
--- /dev/null
+++ b/tcp/options_test.go
@@ -0,0 +1,31 @@
+package tcp
+
+import "testing"
+import "net/url"
+import "reflect"
+
+var tests = []struct {
+	Opt   string
+	Value interface{}
+}{
+	{"addr", "localhost:8080"},
+	{"protocol", "http"},
+	{"transport", "tcp"},
+	{"users", []url.Userinfo{*url.UserPassword("admin", "123456")}},
+}
+
+func TestOptions(t *testing.T) {
+	opts := new(tcpNodeOptions)
+	for _, test := range tests {
+		opts.Set(test.Opt, test.Value)
+		v := opts.Get(test.Opt)
+		if !reflect.DeepEqual(v, test.Value) {
+			t.Log("not equal:", test.Opt, v)
+			t.Fail()
+		}
+	}
+	t.Log("addr:", opts.Addr)
+	t.Log("protocol:", opts.Protocol)
+	t.Log("transport:", opts.Transport)
+	t.Log("users:", opts.Users)
+}
diff --git a/tcp/server.go b/tcp/server.go
new file mode 100644
index 0000000..809ac7f
--- /dev/null
+++ b/tcp/server.go
@@ -0,0 +1,8 @@
+package tcp
+
+type nodeServer struct {
+}
+
+func (s *nodeServer) Run() error {
+	return nil
+}