diff --git a/proxy/proxy.go b/proxy/proxy.go
index 62040b1b..65697734 100644
--- a/proxy/proxy.go
+++ b/proxy/proxy.go
@@ -143,8 +143,8 @@ type OutboundState struct {
 	UplinkWriterDirectCopy bool
 }
 
-func NewTrafficState(userUUID []byte) *TrafficState {
-	return &TrafficState{
+func NewTrafficState(userUUID []byte, flow string) *TrafficState {
+	var state = TrafficState{
 		UserUUID:               userUUID,
 		StartTime:              time.Time{},
 		ByteSent:               0,
@@ -158,26 +158,29 @@ func NewTrafficState(userUUID []byte) *TrafficState {
 		Cipher:                 0,
 		RemainingServerHello:   -1,
 		Inbound: InboundState{
-			WithinPaddingBuffers:     true,
 			UplinkReaderDirectCopy:   false,
 			RemainingCommand:         -1,
 			RemainingContent:         -1,
 			RemainingPadding:         -1,
 			CurrentCommand:           0,
-			IsPadding:                true,
 			DownlinkWriterDirectCopy: false,
 		},
 		Outbound: OutboundState{
-			WithinPaddingBuffers:     true,
 			DownlinkReaderDirectCopy: false,
 			RemainingCommand:         -1,
 			RemainingContent:         -1,
 			RemainingPadding:         -1,
 			CurrentCommand:           0,
-			IsPadding:                true,
 			UplinkWriterDirectCopy:   false,
 		},
 	}
+	if len(flow) > 0 {
+		state.Inbound.IsPadding = true;
+		state.Outbound.IsPadding = true;
+		state.Inbound.WithinPaddingBuffers = true;
+		state.Outbound.WithinPaddingBuffers = true;
+	}
+	return &state
 }
 
 // VisionReader is used to read xtls vision protocol
diff --git a/proxy/vless/encoding/addons.go b/proxy/vless/encoding/addons.go
index 9d3e6a30..b32f3aba 100644
--- a/proxy/vless/encoding/addons.go
+++ b/proxy/vless/encoding/addons.go
@@ -58,21 +58,20 @@ func DecodeHeaderAddons(buffer *buf.Buffer, reader io.Reader) (*Addons, error) {
 
 // EncodeBodyAddons returns a Writer that auto-encrypt content written by caller.
 func EncodeBodyAddons(writer buf.Writer, request *protocol.RequestHeader, requestAddons *Addons, state *proxy.TrafficState, isUplink bool, context context.Context, conn net.Conn, ob *session.Outbound) buf.Writer {
+	w := proxy.NewVisionWriter(writer, state, isUplink, context, conn, ob)
 	if request.Command == protocol.RequestCommandUDP {
-		return NewMultiLengthPacketWriter(writer)
-	}
-	if requestAddons.Flow == vless.XRV {
-		return proxy.NewVisionWriter(writer, state, isUplink, context, conn, ob)
+		return NewMultiLengthPacketWriter(w)
 	}
 	return writer
 }
 
 // DecodeBodyAddons returns a Reader from which caller can fetch decrypted body.
-func DecodeBodyAddons(reader io.Reader, request *protocol.RequestHeader, addons *Addons) buf.Reader {
+func DecodeBodyAddons(reader io.Reader, request *protocol.RequestHeader, addons *Addons, state *proxy.TrafficState, isUplink bool, context context.Context, conn net.Conn, input *bytes.Reader, rawInput *bytes.Buffer, ob *session.Outbound) buf.Reader {
+	r := proxy.NewVisionReader(buf.NewReader(reader), state, isUplink, context, conn, input, rawInput, ob)
 	if request.Command == protocol.RequestCommandUDP {
-		return NewLengthPacketReader(reader)
+		return NewLengthPacketReader(&buf.BufferedReader{Reader: r})
 	}
-	return buf.NewReader(reader)
+	return r
 }
 
 func NewMultiLengthPacketWriter(writer buf.Writer) *MultiLengthPacketWriter {
diff --git a/proxy/vless/inbound/inbound.go b/proxy/vless/inbound/inbound.go
index 916c95c2..0d86cae9 100644
--- a/proxy/vless/inbound/inbound.go
+++ b/proxy/vless/inbound/inbound.go
@@ -556,11 +556,8 @@ func (h *Handler) Process(ctx context.Context, network net.Network, connection s
 		ctx = session.ContextWithAllowedNetwork(ctx, net.Network_UDP)
 	}
 
-	trafficState := proxy.NewTrafficState(userSentID)
-	clientReader := encoding.DecodeBodyAddons(reader, request, requestAddons)
-	if requestAddons.Flow == vless.XRV {
-		clientReader = proxy.NewVisionReader(clientReader, trafficState, true, ctx, connection, input, rawInput, nil)
-	}
+	trafficState := proxy.NewTrafficState(userSentID, account.Flow)
+	clientReader := encoding.DecodeBodyAddons(reader, request, requestAddons, trafficState, true, ctx, connection, input, rawInput, nil)
 
 	bufferWriter := buf.NewBufferedWriter(buf.NewWriter(connection))
 	if err := encoding.EncodeResponseHeader(bufferWriter, request, responseAddons); err != nil {
diff --git a/proxy/vless/outbound/outbound.go b/proxy/vless/outbound/outbound.go
index 91244dce..3aa29b4c 100644
--- a/proxy/vless/outbound/outbound.go
+++ b/proxy/vless/outbound/outbound.go
@@ -210,7 +210,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 
 	clientReader := link.Reader // .(*pipe.Reader)
 	clientWriter := link.Writer // .(*pipe.Writer)
-	trafficState := proxy.NewTrafficState(account.ID.Bytes())
+	trafficState := proxy.NewTrafficState(account.ID.Bytes(), account.Flow)
 	if request.Command == protocol.RequestCommandUDP && (requestAddons.Flow == vless.XRV || (h.cone && request.Port != 53 && request.Port != 443)) {
 		request.Command = protocol.RequestCommandMux
 		request.Address = net.DomainAddress("v1.mux.cool")
@@ -286,16 +286,9 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 		}
 
 		// default: serverReader := buf.NewReader(conn)
-		serverReader := encoding.DecodeBodyAddons(conn, request, responseAddons)
-		if requestAddons.Flow == vless.XRV {
-			serverReader = proxy.NewVisionReader(serverReader, trafficState, false, ctx, conn, input, rawInput, ob)
-		}
+		serverReader := encoding.DecodeBodyAddons(conn, request, responseAddons, trafficState, false, ctx, conn, input, rawInput, ob)
 		if request.Command == protocol.RequestCommandMux && request.Port == 666 {
-			if requestAddons.Flow == vless.XRV {
-				serverReader = xudp.NewPacketReader(&buf.BufferedReader{Reader: serverReader})
-			} else {
-				serverReader = xudp.NewPacketReader(conn)
-			}
+			serverReader = xudp.NewPacketReader(&buf.BufferedReader{Reader: serverReader})
 		}
 
 		if requestAddons.Flow == vless.XRV {