diff --git a/behavior/08_mediator/mediator.go b/behavior/08_mediator/mediator.go
index 9797e75..8c122f3 100644
--- a/behavior/08_mediator/mediator.go
+++ b/behavior/08_mediator/mediator.go
@@ -18,52 +18,52 @@ type Person struct {
 //Tenant 租客
 type Tenant struct {
 	Person
+	m *mediator
 }
 
 //Landlord 房东，要收房租
 type Landlord struct {
 	Person
 	accout int //房东的租金账户
+	m      *mediator
 }
 
-//mediator 中介，比如某居客，某家，某壳，即代表租客跟房东谈条件，又代表房东对付租客
-//mediator  所以中介一定会持有两方的信息，最好用接口代表对象
-//mediator  这里简化一下，直接用类型的引用，表示拥有关系
-type mediator struct {
-	tenant      *Tenant
-	landlord    *Landlord
-	feeLandlord int //向房东收费的账户
-	feeTenant   int //向租客收费的账户
+//Mediator 中介，比如某居客，某家，某壳，即代表租客跟房东谈条件，又代表房东对付租客
+//Mediator  所以中介一定会持有两方的信息，最好用接口代表对象
+//Mediator  这里简化一下，假设中介只为一个房东和一个租客服务，直接用类型的引用，表示拥有关系
+type Mediator struct {
+	tenant        interface{}
+	landlord      interface{}
+	feelandlord   int
+	feelandtenant int
 }
 
 //AskRepair 要求房东修家具
-func (c *tenant) AskRepair(furniture string) {
-	fmt.Printf("CDDriver: reading data %s\n", c.Data)
-	GetMediatorInstance().changed(c)
+func (t *Tenant) AskRepair(furniture string) {
+	fmt.Println("i need landlord fix the:", furniture)
+	t.m.Changed()
 }
 
 //CollectRent 房东收租金了
-func (l *landlord) CollectRent(moneyCount int) {
+func (l *Landlord) CollectRent(moneyCount int) {
 
 	fmt.Printf("CPU: split data with Sound %s, Video %s\n", c.Sound, c.Video)
-	GetMediatorInstance().changed(c)
 }
 
-var mediator *Mediator
+//Changed 中介要提两边或者多边办事，所以它
+func (m *Mediator) Changed(i interface{}) {
 
-func GetMediatorInstance() *Mediator {
-	if mediator == nil {
-		mediator = &Mediator{}
-	}
-	return mediator
 }
 
-func (m *Mediator) changed(i interface{}) {
-	switch inst := i.(type) {
-	case *CDDriver:
-		m.CPU.Process(inst.Data)
-	case *CPU:
-		m.Sound.Play(inst.Sound)
-		m.Video.Display(inst.Video)
-	}
+//PublishRoom 可以在中介这里发布房源
+func (m *Mediator) PublishRoom(landlord interface{}) {
+
+	m.landlord = landlord
+
+}
+
+//RentRom 可以从中介租房子
+func (m *Mediator) RentRom(tenant interface{}) {
+
+	m.tenant = tenant
 }
diff --git a/behavior/08_mediator/mediator_test.go b/behavior/08_mediator/mediator_test.go
index 1f8c78b..773c6a5 100644
--- a/behavior/08_mediator/mediator_test.go
+++ b/behavior/08_mediator/mediator_test.go
@@ -3,32 +3,13 @@ package mediator
 import "testing"
 
 func TestMediator(t *testing.T) {
-	mediator := GetMediatorInstance()
-	mediator.CD = &CDDriver{}
-	mediator.CPU = &CPU{}
-	mediator.Video = &VideoCard{}
-	mediator.Sound = &SoundCard{}
 
-	//Tiggle
-	mediator.CD.ReadData()
+	med := &mediator{}
 
-	if mediator.CD.Data != "music,image" {
-		t.Fatalf("CD unexpect data %s", mediator.CD.Data)
-	}
+	landlord := &Landlord{}
 
-	if mediator.CPU.Sound != "music" {
-		t.Fatalf("CPU unexpect sound data %s", mediator.CPU.Sound)
-	}
+	med.publishRoom(landlord)
 
-	if mediator.CPU.Video != "image" {
-		t.Fatalf("CPU unexpect video data %s", mediator.CPU.Video)
-	}
+	tenant := &Tenant{}
 
-	if mediator.Video.Data != "image" {
-		t.Fatalf("VidoeCard unexpect data %s", mediator.Video.Data)
-	}
-
-	if mediator.Sound.Data != "music" {
-		t.Fatalf("SoundCard unexpect data %s", mediator.Sound.Data)
-	}
 }