diff --git a/api.go b/api.go
index 5f3d328..dce8aaa 100644
--- a/api.go
+++ b/api.go
@@ -6,9 +6,8 @@ import (
 	"errors"
 	"net"
 	"net/http"
-	"regexp"
+	"net/url"
 	"runtime"
-	"slices"
 	"strings"
 	"time"
 
@@ -608,48 +607,51 @@ func (s *Server) RemoveDevice(ctx context.Context, req *pb.RequestWithId) (res *
 }
 
 func (s *Server) SetStreamAlias(ctx context.Context, req *pb.SetStreamAliasRequest) (res *pb.SuccessResponse, err error) {
+	res = &pb.SuccessResponse{}
 	s.Streams.Call(func() error {
-		reg := config.Regexp{
-			Regexp: regexp.MustCompile(req.Alias),
-		}
 		if req.StreamPath != "" {
-			s.StreamAlias = append(s.StreamAlias, StreamAlias{
-				Alias:      reg,
-				Path:       req.StreamPath,
-				AutoRemove: req.AutoRemove,
-			})
-			for publisher := range s.Streams.Range {
-				if streamPath := reg.Replace(publisher.StreamPath, req.StreamPath); streamPath != "" {
-					if publisher2, ok := s.Streams.Get(streamPath); ok {
-						for subscriber := range publisher.Subscribers.Range {
-							publisher.RemoveSubscriber(subscriber)
-							subscriber.setAlias(reg, streamPath)
-							publisher2.AddSubscriber(subscriber)
+			u, err := url.Parse(req.StreamPath)
+			if err != nil {
+				return err
+			}
+			req.StreamPath = strings.TrimPrefix(u.Path, "/")
+			publisher, canReplace := s.Streams.Get(req.StreamPath)
+			if !canReplace {
+				defer s.OnSubscribe(req.StreamPath, u.Query())
+			}
+			if aliasStream, ok := s.AliasStreams.Get(req.Alias); ok { //modify alias
+				aliasStream.AutoRemove = req.AutoRemove
+				if aliasStream.StreamPath != req.StreamPath {
+					aliasStream.StreamPath = req.StreamPath
+					if canReplace {
+						if aliasStream.Publisher != nil {
+							aliasStream.TransferSubscribers(publisher) // replace stream
+						} else {
+							s.Waiting.WakeUp(req.Alias, publisher)
 						}
 					}
 				}
-			}
-			for waitStream := range s.Waiting.Range {
-				if streamPath := reg.Replace(waitStream.StreamPath, req.StreamPath); streamPath != "" {
-					if publisher2, ok := s.Streams.Get(streamPath); ok {
-						for subscriber := range waitStream.Range {
-							waitStream.Remove(subscriber)
-							subscriber.setAlias(reg, streamPath)
-							publisher2.AddSubscriber(subscriber)
-						}
+			} else { // create alias
+				s.AliasStreams.Add(&AliasStream{
+					AutoRemove: req.AutoRemove,
+					StreamPath: req.StreamPath,
+					Alias:      req.Alias,
+				})
+				if canReplace {
+					if aliasStream, ok := s.Streams.Get(req.Alias); ok {
+						aliasStream.TransferSubscribers(publisher) // replace stream
+					} else {
+						s.Waiting.WakeUp(req.Alias, publisher)
 					}
 				}
 			}
 		} else {
-			for i, alias := range s.StreamAlias {
-				if alias.Alias.String() == req.Alias {
-					for subscriber := range s.Subscribers.Range {
-						if subscriber.AliasKey == alias.Alias {
-							subscriber.removeAlias()
-						}
+			if aliasStream, ok := s.AliasStreams.Get(req.Alias); ok {
+				s.AliasStreams.Remove(aliasStream)
+				if aliasStream.Publisher != nil {
+					if publisher, hasTarget := s.Streams.Get(req.Alias); hasTarget { // restore stream
+						aliasStream.TransferSubscribers(publisher)
 					}
-					s.StreamAlias = slices.Delete(s.StreamAlias, i, i+1)
-					break
 				}
 			}
 		}
diff --git a/plugin.go b/plugin.go
index 9d68d58..d49fb95 100644
--- a/plugin.go
+++ b/plugin.go
@@ -352,6 +352,8 @@ func (p *Plugin) OnInit() error {
 func (p *Plugin) OnStop() {
 
 }
+
+// TODO: use alias stream
 func (p *Plugin) OnPublish(pub *Publisher) {
 	onPublish := p.config.OnPub
 	if p.Meta.Pusher != nil {
@@ -391,7 +393,7 @@ func (p *Plugin) OnPublish(pub *Publisher) {
 		}
 	}
 }
-func (p *Plugin) OnSubscribe(sub *Subscriber) {
+func (p *Plugin) OnSubscribe(streamPath string, args url.Values) {
 	//	var avoidTrans bool
 	//AVOID:
 	//	for trans := range server.Transforms.Range {
@@ -404,13 +406,13 @@ func (p *Plugin) OnSubscribe(sub *Subscriber) {
 	//	}
 	for reg, conf := range p.config.OnSub.Pull {
 		if p.Meta.Puller != nil {
-			conf.Args = sub.Args
-			conf.URL = reg.Replace(sub.StreamPath, conf.URL)
-			p.handler.Pull(sub.StreamPath, conf)
+			conf.Args = args
+			conf.URL = reg.Replace(streamPath, conf.URL)
+			p.handler.Pull(streamPath, conf)
 		}
 	}
 	for device := range p.Server.Devices.Range {
-		if device.Status == DeviceStatusOnline && device.GetStreamPath() == sub.StreamPath {
+		if device.Status == DeviceStatusOnline && device.GetStreamPath() == streamPath {
 			device.Handler.Pull()
 		}
 	}
diff --git a/publisher.go b/publisher.go
index e16953f..a178791 100644
--- a/publisher.go
+++ b/publisher.go
@@ -135,6 +135,17 @@ type Publisher struct {
 	dumpFile               *os.File
 }
 
+type AliasStream struct {
+	*Publisher
+	AutoRemove bool
+	StreamPath string
+	Alias      string
+}
+
+func (a *AliasStream) GetKey() string {
+	return a.Alias
+}
+
 func (p *Publisher) SubscriberRange(yield func(sub *Subscriber) bool) {
 	p.Subscribers.Range(yield)
 }
@@ -180,12 +191,19 @@ func (p *Publisher) Start() (err error) {
 		os.MkdirAll(filepath.Dir(f), 0666)
 		p.dumpFile, _ = os.OpenFile(filepath.Join("./dump", p.StreamPath), os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0666)
 	}
-	if waiting, ok := s.Waiting.Get(p.StreamPath); ok {
-		for subscriber := range waiting.Range {
-			p.AddSubscriber(subscriber)
+
+	s.Waiting.WakeUp(p.StreamPath, p)
+
+	for alias := range s.AliasStreams.Range {
+		if alias.StreamPath == p.StreamPath && alias.Publisher == nil {
+			alias.Publisher = p
+			s.Waiting.WakeUp(alias.Alias, p)
+		} else if alias.Publisher.StreamPath != alias.StreamPath {
+			alias.Publisher.TransferSubscribers(p)
+			alias.Publisher = p
 		}
-		s.Waiting.Remove(waiting)
 	}
+
 	for plugin := range s.Plugins.Range {
 		plugin.OnPublish(p)
 	}
@@ -540,43 +558,52 @@ func (p *Publisher) Dispose() {
 	if !p.StopReasonIs(ErrKick) {
 		s.Streams.Remove(p)
 	}
-	if p.Subscribers.Length > 0 {
-		w := s.createWait(p.StreamPath)
-		if p.HasAudioTrack() {
-			w.baseTsAudio = p.AudioTrack.LastTs
-		}
-		if p.HasVideoTrack() {
-			w.baseTsVideo = p.VideoTrack.LastTs
-		}
-		w.Info("takeOver", "pId", p.ID)
-		for subscriber := range p.SubscriberRange {
-			if subscriber.AliasStreamPath != "" {
-				subscriber.removeAlias()
-			} else {
-				subscriber.Publisher = nil
-				w.Add(subscriber)
+	for alias := range s.AliasStreams.Range {
+		if alias.Alias == p.StreamPath {
+			if alias.AutoRemove {
+				s.AliasStreams.Remove(alias)
+			}
+			for subscriber := range p.SubscriberRange {
+				if subscriber.StreamPath == alias.StreamPath {
+					if originStream, ok := s.Streams.Get(alias.StreamPath); ok {
+						p.Subscribers.Remove(subscriber)
+						originStream.AddSubscriber(subscriber)
+					}
+				}
 			}
 		}
-		if w.Length == 0 {
-			s.Waiting.Remove(w)
+	}
+
+	if p.Subscribers.Length > 0 {
+		for subscriber := range p.SubscriberRange {
+			s.Waiting.Wait(subscriber)
 		}
-		p.AudioTrack.Dispose()
-		p.VideoTrack.Dispose()
 		p.Subscribers.Clear()
 	}
+	p.AudioTrack.Dispose()
+	p.VideoTrack.Dispose()
 	p.Info("unpublish", "remain", s.Streams.Length, "reason", p.StopReason())
 	if p.dumpFile != nil {
 		p.dumpFile.Close()
 	}
 	p.State = PublisherStateDisposed
-	var remainAlias []StreamAlias
-	for _, alias := range s.StreamAlias {
-		if alias.Path == p.StreamPath && alias.AutoRemove {
-			continue
-		}
-		remainAlias = append(remainAlias, alias)
+
+}
+
+func (p *Publisher) TransferSubscribers(newPublisher *Publisher) {
+	for subscriber := range p.SubscriberRange {
+		newPublisher.AddSubscriber(subscriber)
+	}
+	p.Subscribers.Clear()
+	p.BufferTime = p.Plugin.GetCommonConf().Publish.BufferTime
+	p.AudioTrack.SetMinBuffer(p.BufferTime)
+	p.VideoTrack.SetMinBuffer(p.BufferTime)
+	if p.State == PublisherStateSubscribed {
+		p.State = PublisherStateWaitSubscriber
+		if p.DelayCloseTimeout > 0 {
+			p.TimeoutTimer.Reset(p.DelayCloseTimeout)
+		}
 	}
-	s.StreamAlias = remainAlias
 }
 
 func (p *Publisher) takeOver(old *Publisher) {
diff --git a/server.go b/server.go
index ec32403..0b7e801 100644
--- a/server.go
+++ b/server.go
@@ -73,10 +73,8 @@ type (
 		}
 	}
 	WaitStream struct {
-		*slog.Logger
 		StreamPath string
 		SubscriberCollection
-		baseTsAudio, baseTsVideo time.Duration
 	}
 	Server struct {
 		pb.UnimplementedApiServer
@@ -84,7 +82,8 @@ type (
 		ServerConfig
 		Plugins         util.Collection[string, *Plugin]
 		Streams         task.Manager[string, *Publisher]
-		Waiting         util.Collection[string, *WaitStream]
+		AliasStreams    util.Collection[string, *AliasStream]
+		Waiting         WaitManager
 		Pulls           task.Manager[string, *PullJob]
 		Pushs           task.Manager[string, *PushJob]
 		Records         task.Manager[string, *RecordJob]
@@ -185,6 +184,7 @@ func (s *Server) Start() (err error) {
 	s.LogHandler.SetLevel(slog.LevelDebug)
 	s.LogHandler.Add(defaultLogHandler)
 	s.Logger = slog.New(&s.LogHandler).With("server", s.ID)
+	s.Waiting.Logger = s.Logger
 	mux := runtime.NewServeMux(runtime.WithMarshalerOption("text/plain", &pb.TextPlain{}), runtime.WithForwardResponseOption(func(ctx context.Context, w http.ResponseWriter, m proto.Message) error {
 		header := w.Header()
 		header.Set("Access-Control-Allow-Credentials", "true")
@@ -378,16 +378,7 @@ func (c *CheckSubWaitTimeout) Tick(any) {
 			c.Info("tick", "cpu", cpu, "streams", c.s.Streams.Length, "subscribers", c.s.Subscribers.Length, "waits", c.s.Waiting.Length)
 		}
 	}
-
-	for waits := range c.s.Waiting.Range {
-		for sub := range waits.Range {
-			select {
-			case <-sub.TimeoutTimer.C:
-				sub.Stop(ErrSubscribeTimeout)
-			default:
-			}
-		}
-	}
+	c.s.Waiting.checkTimeout()
 }
 
 func (gRPC *GRPCServer) Dispose() {
@@ -412,14 +403,10 @@ func (s *Server) Dispose() {
 	}
 }
 
-func (s *Server) createWait(streamPath string) *WaitStream {
-	newPublisher := &WaitStream{
-		StreamPath: streamPath,
-		Logger:     s.Logger.With("streamPath", streamPath),
+func (s *Server) OnSubscribe(streamPath string, args url.Values) {
+	for plugin := range s.Plugins.Range {
+		plugin.OnSubscribe(streamPath, args)
 	}
-	s.Info("createWait")
-	s.Waiting.Set(newPublisher)
-	return newPublisher
 }
 
 func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
diff --git a/subscriber.go b/subscriber.go
index 1beb111..5cf677d 100644
--- a/subscriber.go
+++ b/subscriber.go
@@ -62,8 +62,6 @@ type SubscriberCollection = util.Collection[uint32, *Subscriber]
 type Subscriber struct {
 	PubSubBase
 	config.Subscribe
-	AliasStreamPath            string
-	AliasKey                   config.Regexp
 	Publisher                  *Publisher
 	waitPublishDone            *util.Promise
 	AudioReader, VideoReader   *AVRingReader
@@ -83,67 +81,41 @@ func createSubscriber(p *Plugin, streamPath string, conf config.Subscribe) *Subs
 	return subscriber
 }
 
-func (s *Subscriber) setAlias(key config.Regexp, streamPath string) {
-	s.AliasKey = key
-	s.AliasStreamPath = s.StreamPath
-	s.StreamPath = streamPath
-	s.SetDescription("streamPath", streamPath)
-	s.SetDescription("alias", s.AliasStreamPath)
-}
-
-func (s *Subscriber) removeAlias() {
-	server := s.Plugin.Server
-	if s.Publisher != nil {
-		s.Publisher.RemoveSubscriber(s)
-	} else {
-		if waitStream, ok := server.Waiting.Get(s.StreamPath); ok {
-			waitStream.Remove(s)
-		}
-	}
-	s.StreamPath = s.AliasStreamPath
-	s.AliasStreamPath = ""
-	s.AliasKey = config.Regexp{}
-	s.RemoveDescription("alias")
-	s.SetDescription("streamPath", s.StreamPath)
-	if publisher, ok := server.Streams.Get(s.StreamPath); ok {
-		publisher.AddSubscriber(s)
-		return
-	} else {
-		if waitStream, ok := server.Waiting.Get(s.StreamPath); ok {
-			waitStream.Add(s)
-		} else {
-			server.createWait(s.StreamPath).Add(s)
-		}
-		for plugin := range server.Plugins.Range {
-			plugin.OnSubscribe(s)
-		}
-	}
-}
-
 func (s *Subscriber) Start() (err error) {
 	server := s.Plugin.Server
 	server.Subscribers.Add(s)
 	s.Info("subscribe")
 
-	for _, alias := range server.StreamAlias {
-		if streamPath := alias.Alias.Replace(s.StreamPath, alias.Path); streamPath != "" {
-			s.setAlias(alias.Alias, streamPath)
-			break
+	if alias, ok := server.AliasStreams.Get(s.StreamPath); ok {
+		if alias.Publisher != nil {
+			alias.Publisher.AddSubscriber(s)
+			return
+		} else {
+			server.OnSubscribe(alias.StreamPath, s.Args)
+		}
+	} else {
+		for _, alias := range server.StreamAlias {
+			if streamPath := alias.Alias.Replace(s.StreamPath, alias.Path); streamPath != "" {
+				server.AliasStreams.Set(&AliasStream{
+					StreamPath: streamPath,
+					Alias:      s.StreamPath,
+				})
+				if publisher, ok := server.Streams.Get(streamPath); ok {
+					publisher.AddSubscriber(s)
+					return
+				} else {
+					server.OnSubscribe(streamPath, s.Args)
+				}
+				break
+			}
 		}
 	}
-
 	if publisher, ok := server.Streams.Get(s.StreamPath); ok {
 		publisher.AddSubscriber(s)
 		return
 	} else {
-		if waitStream, ok := server.Waiting.Get(s.StreamPath); ok {
-			waitStream.Add(s)
-		} else {
-			server.createWait(s.StreamPath).Add(s)
-		}
-		for plugin := range server.Plugins.Range {
-			plugin.OnSubscribe(s)
-		}
+		server.Waiting.Wait(s)
+		server.OnSubscribe(s.StreamPath, s.Args)
 	}
 	return
 }
@@ -153,8 +125,8 @@ func (s *Subscriber) Dispose() {
 	s.Info("unsubscribe", "reason", s.StopReason())
 	if s.Publisher != nil {
 		s.Publisher.RemoveSubscriber(s)
-	} else if waitStream, ok := s.Plugin.Server.Waiting.Get(s.StreamPath); ok {
-		waitStream.Remove(s)
+	} else {
+		s.Plugin.Server.Waiting.Leave(s)
 	}
 }
 
diff --git a/wait-stream.go b/wait-stream.go
new file mode 100644
index 0000000..309dde5
--- /dev/null
+++ b/wait-stream.go
@@ -0,0 +1,55 @@
+package m7s
+
+import (
+	"log/slog"
+
+	. "m7s.live/m7s/v5/pkg"
+	"m7s.live/m7s/v5/pkg/util"
+)
+
+type WaitManager struct {
+	*slog.Logger
+	util.Collection[string, *WaitStream]
+}
+
+func (w *WaitManager) Wait(subscriber *Subscriber) *WaitStream {
+	subscriber.Publisher = nil
+	if waiting, ok := w.Get(subscriber.StreamPath); ok {
+		waiting.Add(subscriber)
+		return waiting
+	} else {
+		waiting := &WaitStream{
+			StreamPath: subscriber.StreamPath,
+		}
+		w.Set(waiting)
+		waiting.Add(subscriber)
+		return waiting
+	}
+}
+
+func (w *WaitManager) WakeUp(streamPath string, publisher *Publisher) {
+	if waiting, ok := w.Get(streamPath); ok {
+		for subscriber := range waiting.Range {
+			publisher.AddSubscriber(subscriber)
+		}
+		w.Remove(waiting)
+	}
+}
+
+func (w *WaitManager) checkTimeout() {
+	for waits := range w.Range {
+		for sub := range waits.Range {
+			select {
+			case <-sub.TimeoutTimer.C:
+				sub.Stop(ErrSubscribeTimeout)
+			default:
+			}
+		}
+	}
+}
+
+func (w *WaitManager) Leave(s *Subscriber) {
+	if waitStream, ok := w.Get(s.StreamPath); ok {
+		waitStream.Remove(s)
+	}
+}