diff --git a/requester/tcpaddr_cache.go b/requester/tcpaddr_cache.go
index 4303e4c5..877ed3f7 100644
--- a/requester/tcpaddr_cache.go
+++ b/requester/tcpaddr_cache.go
@@ -24,9 +24,16 @@ type tcpAddrCache struct {
 	gcStarted bool
 }
 
+// tcpAddrItem tcpAddrCache中缓存的带有超时的TcpAddr
+type tcpAddrItem struct {
+	ta *net.TCPAddr
+	expire <-chan time.Time // 缓存项是否过期
+}
+
 // Set 设置
 func (tac *tcpAddrCache) Set(address string, ta *net.TCPAddr) {
-	tac.ta.Store(address, ta)
+	item := &tcpAddrItem{ta, time.After(tac.lifeTime)}
+	tac.ta.Store(address, item)
 }
 
 // Existed 检测存在
@@ -43,15 +50,21 @@ func (tac *tcpAddrCache) Existed(address string) bool {
 func (tac *tcpAddrCache) Get(address string) *net.TCPAddr {
 	if tac.Existed(address) {
 		value, _ := tac.ta.Load(address)
-		return value.(*net.TCPAddr)
+		return value.(*tcpAddrItem).ta
 	}
 
 	return nil
 }
 
 // SetLifeTime 设置生命周期
+// 重新设定生命周期将会影响所有的缓存项
 func (tac *tcpAddrCache) SetLifeTime(t time.Duration) {
 	tac.lifeTime = t
+	tac.ta.Range(func(_, v interface{}) bool {
+		item := v.(*tcpAddrItem)
+		item.expire = time.After(tac.lifeTime)
+		return true
+	})
 }
 
 // GC 缓存回收
@@ -76,9 +89,15 @@ func (tac *tcpAddrCache) Del(address string) {
 
 // DelAll 清空缓存
 func (tac *tcpAddrCache) DelAll() {
-	tac.ta.Range(func(address, _ interface{}) bool {
-		tac.ta.Delete(address)
-		return true
+	tac.ta.Range(func(address, v interface{}) bool {
+		item := v.(*tcpAddrItem)
+		select {
+		case <- item.expire: // 如果超时再删去缓存项，避免在接近lifeTime前添加的缓存项被删除
+			tac.ta.Delete(address)
+			return true
+		default:
+			return true
+		}
 	})
 }
 
@@ -87,7 +106,7 @@ func (tac *tcpAddrCache) PrintAll() {
 	tb := pcstable.NewTable(os.Stdout)
 	tb.SetHeader([]string{"address", "tcpaddr"})
 	tac.ta.Range(func(address, tcpaddr interface{}) bool {
-		tb.Append([]string{address.(string), fmt.Sprint(tcpaddr.(*net.TCPAddr))})
+		tb.Append([]string{address.(string), fmt.Sprint(tcpaddr.(*tcpAddrItem).ta)})
 		return true
 	})
 	tb.Render()