diff --git a/dip.go b/dip.go
index 63ad582..689c60b 100644
--- a/dip.go
+++ b/dip.go
@@ -45,6 +45,7 @@ func (worker *DIPWorker) ShowGroupInfo() string {
 
 type DIPGroup struct {
 	Group      map[string]*DHost // 原始参照
+	Waitor     map[string]*DHost
 	Ready      map[string]*DHost
 	IPTableNum string
 	Current    *DHost
@@ -55,11 +56,13 @@ type DIPGroup struct {
 func NewDIPGroup() *DIPGroup {
 	group := DIPGroup{}
 	group.Group = make(map[string]*DHost)
+	group.Waitor = make(map[string]*DHost)
 	group.Ready = make(map[string]*DHost)
 	group.Mutex = &sync.Mutex{}
 	return &group
 }
 
+// Choose 选择一个正在准备的vps节点
 func (group *DIPGroup) Choose(addr string) {
 	now := time.Now().Unix()
 	for ip, dhost := range group.Ready {
@@ -81,6 +84,7 @@ func (group *DIPGroup) Choose(addr string) {
 			}
 		}
 
+		group.Waitor[ip] = group.Ready[ip]
 		delete(group.Ready, ip)
 
 		break
@@ -99,8 +103,8 @@ func NewDHost(host string) *DHost {
 	return &dh
 }
 
-func (dh *DHost) OverTime(now int64) int64 {
-	if now-dh.ActiveTime >= 150 {
+func (dh *DHost) OverTime(now int64, limit int64) int64 {
+	if now-dh.ActiveTime >= limit {
 		return now - dh.ActiveTime
 	}
 	return 0
diff --git a/switch.go b/switch.go
index 8415950..0748065 100644
--- a/switch.go
+++ b/switch.go
@@ -92,6 +92,14 @@ func (swi *Switch) checkInReady(ip string, now int64) {
 
 		dipg.Group[ip].ActiveTime = now
 
+		if dh, ok := dipg.Waitor[ip]; ok {
+			if dh.OverTime(now, 20) > 0 {
+				delete(dipg.Waitor, ip)
+			} else {
+				return
+			}
+		}
+
 		if dipg.Current == nil {
 			dhost := NewDHost(ip)
 			dhost.ActiveTime = now
@@ -161,7 +169,7 @@ func (swi *Switch) switchActives(w http.ResponseWriter, req *http.Request) {
 
 		isappend := int64(1)
 		for _, dhost := range group.Group {
-			isappend *= dhost.OverTime(now)
+			isappend *= dhost.OverTime(now, 150)
 		}
 		if isappend == 0 {
 			content = append(content, addr)