diff --git a/hello/HelloProtocol.go b/hello/HelloProtocol.go
index 89d3838..8c209d6 100644
--- a/hello/HelloProtocol.go
+++ b/hello/HelloProtocol.go
@@ -19,6 +19,7 @@ import (
 	"mlsr/lsdb"
 	"mlsr/route"
 	"mlsr/utils"
+	"time"
 )
 
 //  用于hello兴趣包的名称的组件
@@ -37,7 +38,7 @@ type TimeoutCallback = func(interest *packet.Interest)
 //type OptionalNack = *packet.Nack
 
 type HelloProtocol struct {
-	m_face          *logicface.LogicFace
+	m_face          *logicface.LogicFaceICN
 	m_scheduler     *lsdb.MlsrScheduler
 	m_keychain      *security.KeyChain
 	mlsrConfig      *common.MlsrConfig
@@ -64,7 +65,7 @@ type HelloProtocol struct {
 //  @param routingTable
 //  @param mlsdb
 //
-func (hp *HelloProtocol) Init(face *logicface.LogicFace,
+func (hp *HelloProtocol) Init(face *logicface.LogicFaceICN,
 	scheduler *lsdb.MlsrScheduler,
 	keychain *security.KeyChain, mlsrConfig *common.MlsrConfig,
 	routingTable *route.RoutingTable, mlsdb *lsdb.Lsdb) {
@@ -115,7 +116,12 @@ func (hp *HelloProtocol) expressInterest(interestName *component.Identifier, _mi
 	interest := packet.NewInterest()
 	interest.SetName(interestName)
 	interest.SetInterestLifeTime(uint64(_millseconds))
-	// todo 这里需要实现的是，将兴趣包通过face发出，并对超时、nack、正常应答三种情况进行处理
+	// 将兴趣包通过face发出，并对超时、nack、正常应答三种情况进行处理
+	err := hp.m_face.ExpressInterest(interest, hp.onContent, hp.processInterestTimedOut, hp.processInterestNack)
+	if err != nil {
+		common2.LogDebug("HelloProtocol express interest error, maybe the icn logic face doesn't work.", err)
+		return
+	}
 }
 
 //
@@ -158,13 +164,33 @@ func (hp *HelloProtocol) SendHelloInterest(neighbor *component.Identifier) {
 	}
 }
 
+//
+//  processInterestNack
+//  @Description: 发送兴趣包给邻居路由器，当收到nack时，执行本函数
+//  @receiver hp
+//  @param interest
+//  @param nack
+//
+func (hp *HelloProtocol) processInterestNack(interest *packet.Interest, nack *packet.Nack) {
+	common2.LogDebug("HelloProtocol receive nack for interest: "+interest.GetName().ToUri()+
+		", the nack reason is: ", nack.GetNackReason(), "will treat as time out in 2s later.")
+	job, err := hp.m_scheduler.ScheduleTaskAfterDuration(2*time.Second, 1).
+		Do(hp.processInterestTimedOut, interest)
+	job.LimitRunsTo(1)
+	hp.m_scheduler.StartAsync()
+	if err != nil {
+		common2.LogError("HelloProtocol ScheduleTask to processInterestTimedOut error. ", err.Error())
+	}
+}
+
 //
 //  processInterestTimedOut
-//  @Description: 发送兴趣包给邻居路由器，当超时或nack时，执行本函数
+//  @Description: 发送兴趣包给邻居路由器，当超时时，执行本函数
 //  @receiver hp
 //  @param interest
 //
 func (hp *HelloProtocol) processInterestTimedOut(interest *packet.Interest) {
+	common2.LogDebug("HelloProtocol time out for interest: " + interest.GetName().ToUri())
 	// interest name: /<neighbor>/NLSR/INFO/<router>
 	interestName := interest.GetName()
 	// 取出兴趣包倒数第二个组件，对其进行校验