diff --git a/behavior/10_state/state.go b/behavior/10_state/state.go
index 60c83fa..86a3bf3 100644
--- a/behavior/10_state/state.go
+++ b/behavior/10_state/state.go
@@ -1,5 +1,78 @@
 package state
 
-//IRobot 代表机器人
-type IRobot interface {
+import (
+	"fmt"
+	"time"
+)
+
+////////////////////////////////
+//使用机器人状态转换的例子
+//简化示例，假定机器人有：走，跑，静止三种活动状态
+
+//IRobotState 代表机器人此时的活动状态
+type IRobotState interface {
+	//上下文可以用于传递参数
+	Move(*SportRobot)
+}
+
+//SportRobot 定义一个运动机器人
+type SportRobot struct {
+	Name         string
+	stateMachine IRobotState //状态机
+}
+
+//Move action，主动行为
+func (s *SportRobot) Move() {
+	s.stateMachine.Move(s)
+}
+
+//UpdateState 更新状态
+func (s *SportRobot) UpdateState(newState IRobotState) {
+	s.stateMachine = newState
+	//触发行为
+	s.stateMachine.Move(s)
+}
+
+//NewSportRobot 生产一个机器人
+func NewSportRobot(name string) *SportRobot {
+	//默认一个状态
+	return &SportRobot{
+		Name:         name,
+		stateMachine: &StillState{},
+	}
+
+}
+
+//RuningState 奔跑状态
+type RuningState struct {
+}
+
+//Move 实现跑的状态
+func (r *RuningState) Move(robot *SportRobot) {
+
+	fmt.Println("i'm robot:", robot.Name)
+	fmt.Println("i am running", time.Now())
+
+}
+
+//WalkState 行走状态
+type WalkState struct {
+}
+
+//Move 实现行走状态
+func (w *WalkState) Move(robot *SportRobot) {
+	fmt.Println("i'm robot:", robot.Name)
+	fmt.Println("i am waling", time.Now())
+
+}
+
+//StillState 静止状态
+type StillState struct {
+}
+
+//Move 实现静止状态
+func (s *StillState) Move(robot *SportRobot) {
+	fmt.Println("i'm robot:", robot.Name)
+	fmt.Println("i am sitting", time.Now())
+
 }
diff --git a/behavior/10_state/state_test.go b/behavior/10_state/state_test.go
index ea4bc17..f30e69f 100644
--- a/behavior/10_state/state_test.go
+++ b/behavior/10_state/state_test.go
@@ -1,8 +1,33 @@
 package state
 
-import "testing"
+import (
+	"testing"
+	"time"
+)
 
-func TestState(t *testing.T) {
+func TestRobotState(t *testing.T) {
+
+	robot := NewSportRobot("home keeper")
+
+	//主动驱动行为
+	robot.Move()
+
+	//跑
+	robot.UpdateState(&RuningState{})
+
+	//跑一会
+	time.Sleep(time.Millisecond * 234)
+
+	//走
+	robot.UpdateState(&WalkState{})
+
+	//走一会儿
+	time.Sleep(time.Millisecond * 544)
+	//继续跑
+	robot.UpdateState(&RuningState{})
+
+}
+func TestAlarmState(t *testing.T) {
 
 	expect := "vibrating humming ... vibrating humming...vibrating humming..." +
 		"vibrating humming ... vibrating humming...vibrating humming..." +
@@ -22,6 +47,6 @@ func TestState(t *testing.T) {
 	ringsSounds += mobile.Alert()
 
 	if ringsSounds != expect {
-		t.Errorf("Expect result to equal %s, but %s.\n", expect, result)
+		t.Errorf("Expect result to equal %s, but %s.\n", expect, ringsSounds)
 	}
 }