diff --git a/behavioral/chain_of_responsibility/go_test.go b/behavioral/chain_of_responsibility/go_test.go
new file mode 100644
index 0000000..536288c
--- /dev/null
+++ b/behavioral/chain_of_responsibility/go_test.go
@@ -0,0 +1,42 @@
+package main
+
+import (
+	"log"
+	"sync"
+	"testing"
+	"time"
+)
+
+// 想弄清楚slice遍历时被修改到底会发生什么.
+// 结果是安全失败.
+// 并不意味着是线程安全的.
+func TestGo(t *testing.T){
+	s := make([]int ,0)
+	wg := &sync.WaitGroup{}
+	wg.Add(2)
+	for i:=0 ;i<10 ;i++{
+		s = append(s, i)
+	}
+
+	itv := time.Second
+	go func() {
+		defer wg.Done()
+		for k ,v := range s{
+			println(k ,v)
+			time.Sleep(itv)
+		}
+	}()
+
+	time.Sleep(itv)
+
+	go func() {
+		defer wg.Done()
+		s = append(s ,810)
+		time.Sleep(itv)
+		s = append(s ,114)
+		log.Println("add")
+	}()
+
+	wg.Wait()
+	log.Println(s)
+}
diff --git a/behavioral/chain_of_responsibility/main.go b/behavioral/chain_of_responsibility/main.go
new file mode 100644
index 0000000..e88bc9a
--- /dev/null
+++ b/behavioral/chain_of_responsibility/main.go
@@ -0,0 +1,74 @@
+package main
+
+type GameType int
+
+const (
+	TypeFPS GameType = 1
+	TypeRPG			 = TypeFPS << 1
+)
+
+type Game interface {
+	Type() GameType
+	Start(player string)
+}
+
+// chain of responsibility
+type GameSelector struct {
+	GameList []Game
+}
+
+func (g *GameSelector)AddGame(games ...Game){
+	g.GameList = append(g.GameList ,games...)
+}
+
+func (g GameSelector) Start(t GameType, player string) {
+	for _ ,v := range g.GameList{
+		if v.Type() == t{
+			v.Start(player)
+			return
+		}
+	}
+}
+
+type FPSGame struct {
+	t GameType
+}
+
+func (f FPSGame) Start(player string) {
+	println(player ,"join in fps game")
+}
+
+func (f FPSGame)Type() GameType{
+	return f.t
+}
+
+type RPGGame struct {
+	t GameType
+}
+
+func (RPGGame) Start(player string) {
+	println(player ,"join in rpg game")
+}
+
+func (r RPGGame)Type() GameType{
+	return r.t
+}
+
+func main(){
+	fps := FPSGame{TypeFPS}
+	rpg := RPGGame{TypeRPG}
+
+	sl := GameSelector{make([]Game ,0)}
+	sl.AddGame(fps ,rpg)
+
+	player := "icg"
+	sl.Start(TypeRPG ,player)
+	println()
+	sl.Start(TypeFPS ,player)
+	// output:
+	/*
+	icg join in rpg game
+
+	icg join in fps game
+	 */
+}