diff --git a/server/command/command.go b/server/command/command.go
index ff2c607..08873ab 100644
--- a/server/command/command.go
+++ b/server/command/command.go
@@ -1,86 +1,10 @@
 package command
 
 import (
-	"io"
-	"unsafe"
-
-	pk "github.com/Tnze/go-mc/net/packet"
+	"github.com/Tnze/go-mc/chat"
+	"strings"
 )
 
-type CmdSet struct {
-	root  int32
-	nodes []Node
-}
-
-func NewCmdSet() *CmdSet {
-	return &CmdSet{
-		root: 0,
-		nodes: []Node{
-			{
-				flags:  TypeRoot,
-				parser: nil,
-			},
-		},
-	}
-}
-
-func (c *CmdSet) AddNode(n Node) int32 {
-	c.nodes = append(c.nodes, n)
-	return int32(len(c.nodes) - 1)
-}
-
-func (c *CmdSet) WriteTo(w io.Writer) (int64, error) {
-	return pk.Tuple{
-		pk.Array(c.nodes),
-		pk.VarInt(c.root),
-	}.WriteTo(w)
-}
-
-func (c *CmdSet) Execute(cmd string) error {
-	for _, child := range c.nodes[c.root].children {
-		if node := c.nodes[child]; node.flags&0x03 == TypeLiteral {
-
-		}
-	}
-}
-
-type Node struct {
-	flags       byte
-	children    []int32
-	redirect    int32
-	name        string
-	parser      Parser
-	suggestions string
-}
-
-func (n *Node) WriteTo(w io.Writer) (int64, error) {
-	return pk.Tuple{
-		pk.Byte(n.flags),
-		pk.Array(*(*[]pk.VarInt)(unsafe.Pointer(&n.children))),
-		pk.Opt{ // Redirect
-			Has:   n.flags&HasRedirect != 0,
-			Field: pk.VarInt(n.redirect),
-		},
-		pk.Opt{ // Name
-			Has:   n.flags&0x03 == TypeLiteral || n.flags&0x03 == TypeArgument,
-			Field: pk.String(n.name),
-		},
-		pk.Opt{ // Parser & Properties
-			Has:   n.flags&0x03 == TypeArgument,
-			Field: n.parser,
-		},
-		pk.Opt{
-			Has:   n.flags&HasSuggestionsType != 0,
-			Field: pk.Identifier(n.suggestions),
-		},
-	}.WriteTo(w)
-}
-
-type Parser interface {
-	pk.FieldEncoder
-	Parse(cmd string) (token string, value interface{}, err error)
-}
-
 const (
 	TypeRoot byte = iota
 	TypeLiteral
@@ -93,3 +17,207 @@ const (
 	HasRedirect
 	HasSuggestionsType
 )
+
+type Node interface {
+	Then(nodes ...Node) Node
+	Runnable() HandleFunc
+	Parse(cmd string, store map[string]interface{}) (token string, next Node, err error)
+}
+
+type Root struct {
+	children map[string]Node
+}
+
+type HandleFunc func(args map[string]interface{})
+
+func NewGraph() *Root {
+	return &Root{children: make(map[string]Node)}
+}
+
+func (r *Root) Then(nodes ...Node) Node {
+	for _, node := range nodes {
+		l, ok := node.(*Literal)
+		if !ok {
+			panic("you could only add Literal node to Root")
+		}
+		if _, ok := r.children[l.Name]; ok {
+			panic("the Literal(" + l.Name + ") is already exist")
+		}
+		r.children[l.Name] = node
+	}
+	return r
+}
+
+func Lite(literal string) *Literal {
+	return &Literal{Name: literal}
+}
+
+func Arg(name string, parser Parser) *Argument {
+	return &Argument{Name: name, Parser: parser}
+}
+
+func (r *Root) Runnable() HandleFunc {
+	return nil
+}
+
+func (r *Root) Parse(cmd string, _ map[string]interface{}) (token string, next Node, err error) {
+	token, value, err := StringParser(0).Parse(cmd)
+	if err != nil {
+		return "", nil, err
+	}
+	child, ok := r.children[value.(string)]
+	if !ok {
+		return "", nil, Error{chat.TranslateMsg("command.unknown.command")}
+	}
+	return "", child, nil
+}
+
+func (r *Root) Run(cmd string) error {
+	var node Node = r
+	args := make(map[string]interface{})
+	for {
+		token, next, err := node.Parse(cmd, args)
+		if err != nil {
+			return err
+		}
+		cmd = strings.TrimSpace(strings.TrimPrefix(cmd, token))
+		if next == nil || len(cmd) == 0 {
+			f := node.Runnable()
+			if f == nil {
+				return Error{chat.TranslateMsg("command.unknown.command")}
+			}
+			f(args)
+			return nil
+		}
+		node = next
+	}
+}
+
+type Children struct {
+	Lite map[string]*Literal
+	Args *Argument
+}
+
+func (c *Children) add(nodes []Node) {
+	for _, node := range nodes {
+		switch node.(type) {
+		case *Literal:
+			if c.Args != nil {
+				panic("this Node already has an Argument Node children, cannot Add Literal Node")
+			}
+			if c.Lite == nil {
+				c.Lite = make(map[string]*Literal)
+			}
+			child := node.(*Literal)
+			c.Lite[child.Name] = child
+		case *Argument:
+			if c.Lite != nil {
+				panic("this Node already has Literal Node children, cannot Add Argument Node")
+			}
+			if c.Args != nil {
+				panic("this Node already set an Argument Node child, cannot be duplicate")
+			}
+			c.Args = node.(*Argument)
+		}
+	}
+	return
+}
+
+type Handler struct {
+	Handler HandleFunc
+}
+
+func (h *Handler) Handle(f HandleFunc) {
+	if h.Handler != nil {
+		panic("handler func set twice")
+	}
+	h.Handler = f
+}
+
+func (h *Handler) Runnable() HandleFunc {
+	return h.Handler
+}
+
+type Literal struct {
+	Name string
+	Children
+	Handler
+}
+
+func (l *Literal) Then(nodes ...Node) Node {
+	l.add(nodes)
+	return l
+}
+
+func (l *Literal) Parse(cmd string, store map[string]interface{}) (token string, next Node, err error) {
+	cmd = strings.TrimPrefix(cmd, l.Name)
+	store[l.Name] = nil
+	if l.Children.Lite != nil {
+		token, value, err := StringParser(0).Parse(strings.TrimSpace(cmd))
+		if err != nil {
+			return token, nil, err
+		}
+		if next, ok := l.Children.Lite[value.(string)]; ok {
+			return l.Name, next, nil
+		}
+		return "", nil, Error{chat.TranslateMsg("command.unknown.command")}
+	} else if l.Children.Args != nil {
+		return l.Name, l.Children.Args, nil
+	} else {
+		return l.Name, nil, nil
+	}
+}
+
+func (l *Literal) Handle(f HandleFunc) Node {
+	l.Handler.Handle(f)
+	return l
+}
+
+type Argument struct {
+	Name string
+	Children
+	Parser Parser
+	Handler
+}
+
+func (a *Argument) Parse(cmd string, store map[string]interface{}) (token string, next Node, err error) {
+	token, value, err := a.Parser.Parse(cmd)
+	if err != nil {
+		return "", nil, err
+	}
+	store[a.Name] = value
+	cmd = strings.TrimSpace(strings.TrimPrefix(cmd, token))
+
+	if a.Children.Lite != nil {
+		_, value, err := StringParser(0).Parse(strings.TrimSpace(cmd))
+		if err != nil {
+			return token, nil, err
+		}
+		if next, ok := a.Children.Lite[value.(string)]; ok {
+			return token, next, nil
+		}
+		return "", nil, Error{chat.TranslateMsg("command.unknown.command")}
+	} else if a.Children.Args != nil {
+		return token, a.Children.Args, nil
+	} else {
+		return token, nil, nil
+	}
+}
+
+func (a *Argument) Then(nodes ...Node) Node {
+	a.add(nodes)
+	return a
+}
+
+func (a *Argument) Handle(f HandleFunc) Node {
+	a.Handler.Handle(f)
+	return a
+}
+
+type Error struct {
+	msg chat.Message
+}
+
+func (e Error) Error() string {
+	return e.msg.String()
+}
diff --git a/server/command/command_test.go b/server/command/command_test.go
new file mode 100644
index 0000000..d1a35df
--- /dev/null
+++ b/server/command/command_test.go
@@ -0,0 +1,52 @@
+package command
+
+import "testing"
+
+func TestRoot_Run(t *testing.T) {
+	g := NewGraph().Then(
+		Lite("whitelist").Then(
+			Lite("add").Then(
+				Arg("targets", StringParser(0)).
+					Handle(func(args map[string]interface{}) {
+						t.Logf("whitelist add: %v", args)
+					})),
+			Lite("remove").Then(
+				Arg("targets", StringParser(0)).
+					Handle(func(args map[string]interface{}) {
+						t.Logf("whitelist remove: %v", args)
+					})),
+			Lite("on").Handle(func(args map[string]interface{}) {
+				t.Logf("whitelist on: %v", args)
+			}),
+			Lite("off").Handle(func(args map[string]interface{}) {
+				t.Logf("whitelist off: %v", args)
+			}),
+		),
+	).(*Root)
+
+	targetA := Arg("targetA", StringParser(0))
+	targetB := Arg("targetB", StringParser(0))
+	targetB.Handle(func(args map[string]interface{}) {
+		t.Logf("tp A <from/to> B parsed: %v", args)
+	})
+	tp := Lite("tp").Then(targetA.Then(
+		Lite("form").Then(targetB),
+		Lite("to").Then(targetB),
+	))
+	g.Then(tp)
+
+	err := g.Run("tp Tnze to Xi_Xi_Mi")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	//g2 := NewGraph()
+	//g2.Then(
+	//	g.Lite("whitelist").Then(
+	//		// using reflect to generate all arguments nodes
+	//		g.Lite("add").Then(g.Func(func(player GameProfile) {
+	//
+	//		})),
+	//	),
+	//)
+}