diff --git a/common/common.go b/common/common.go
index a862c9281..4fbdfa22b 100644
--- a/common/common.go
+++ b/common/common.go
@@ -1,8 +1,10 @@
 package common
 
 import (
+	"bufio"
 	"crypto/sha256"
 	"fmt"
+	"io"
 )
 
 type Runnable interface {
@@ -10,6 +12,10 @@ type Runnable interface {
 	Close() error
 }
 
+func NewBufReadWriter(rw io.ReadWriter) *bufio.ReadWriter {
+	return bufio.NewReadWriter(bufio.NewReader(rw), bufio.NewWriter(rw))
+}
+
 func SHA224String(password string) string {
 	hash := sha256.New224()
 	hash.Write([]byte(password))
diff --git a/protocol/direct/outbound.go b/protocol/direct/outbound.go
index b51f35354..2f4e0cbbe 100644
--- a/protocol/direct/outbound.go
+++ b/protocol/direct/outbound.go
@@ -1,6 +1,7 @@
 package direct
 
 import (
+	"bufio"
 	"context"
 	"io"
 	"net"
@@ -12,16 +13,18 @@ import (
 
 type DirectOutboundConnSession struct {
 	protocol.ConnSession
-	conn    io.ReadWriteCloser
-	request *protocol.Request
+	conn          io.ReadWriteCloser
+	bufReadWriter *bufio.ReadWriter
+	request       *protocol.Request
 }
 
 func (o *DirectOutboundConnSession) Read(p []byte) (int, error) {
-	return o.conn.Read(p)
+	return o.bufReadWriter.Read(p)
 }
 
 func (o *DirectOutboundConnSession) Write(p []byte) (int, error) {
-	return o.conn.Write(p)
+	defer o.bufReadWriter.Flush()
+	return o.bufReadWriter.Write(p)
 }
 
 func (o *DirectOutboundConnSession) Close() error {
@@ -37,6 +40,7 @@ func NewOutboundConnSession(conn io.ReadWriteCloser, req *protocol.Request) (pro
 			return nil, err
 		}
 		o.conn = newConn
+		o.bufReadWriter = common.NewBufReadWriter(newConn)
 	} else {
 		o.conn = conn
 	}
diff --git a/protocol/trojan/inbound.go b/protocol/trojan/inbound.go
index 254ee86f0..3f15f1196 100644
--- a/protocol/trojan/inbound.go
+++ b/protocol/trojan/inbound.go
@@ -11,23 +11,24 @@ import (
 
 type TrojanInboundConnSession struct {
 	protocol.ConnSession
-	config     *conf.GlobalConfig
-	request    *protocol.Request
-	bufReader  *bufio.Reader
-	conn       net.Conn
-	uploaded   int
-	downloaded int
-	userHash   string
+	config        *conf.GlobalConfig
+	request       *protocol.Request
+	bufReadWriter *bufio.ReadWriter
+	conn          net.Conn
+	uploaded      int
+	downloaded    int
+	userHash      string
 }
 
 func (i *TrojanInboundConnSession) Write(p []byte) (int, error) {
-	n, err := i.conn.Write(p)
+	n, err := i.bufReadWriter.Write(p)
+	i.bufReadWriter.Flush()
 	i.uploaded += n
 	return n, err
 }
 
 func (i *TrojanInboundConnSession) Read(p []byte) (int, error) {
-	n, err := i.bufReader.Read(p)
+	n, err := i.bufReadWriter.Read(p)
 	i.downloaded += n
 	return n, err
 }
@@ -42,7 +43,7 @@ func (i *TrojanInboundConnSession) GetRequest() *protocol.Request {
 }
 
 func (i *TrojanInboundConnSession) parseRequest() error {
-	userHash, err := i.bufReader.Peek(56)
+	userHash, err := i.bufReadWriter.Peek(56)
 	if err != nil {
 		return common.NewError("failed to read hash").Base(err)
 	}
@@ -57,9 +58,9 @@ func (i *TrojanInboundConnSession) parseRequest() error {
 		logger.Warn("invalid hash or other protocol:", string(userHash))
 		return nil
 	}
-	i.bufReader.Discard(56 + 2)
+	i.bufReadWriter.Discard(56 + 2)
 
-	cmd, err := i.bufReader.ReadByte()
+	cmd, err := i.bufReadWriter.ReadByte()
 	network := "tcp"
 	switch protocol.Command(cmd) {
 	case protocol.Connect, protocol.Mux:
@@ -73,7 +74,7 @@ func (i *TrojanInboundConnSession) parseRequest() error {
 		return common.NewError("failed to read cmd").Base(err)
 	}
 
-	req, err := protocol.ParseAddress(i.bufReader)
+	req, err := protocol.ParseAddress(i.bufReadWriter)
 	if err != nil {
 		return common.NewError("failed to parse address").Base(err)
 	}
@@ -81,15 +82,15 @@ func (i *TrojanInboundConnSession) parseRequest() error {
 	req.NetworkType = network
 	i.request = req
 
-	i.bufReader.Discard(2)
+	i.bufReadWriter.Discard(2)
 	return nil
 }
 
 func NewInboundConnSession(conn net.Conn, config *conf.GlobalConfig) (protocol.ConnSession, error) {
 	i := &TrojanInboundConnSession{
-		config:    config,
-		conn:      conn,
-		bufReader: bufio.NewReader(conn),
+		config:        config,
+		conn:          conn,
+		bufReadWriter: common.NewBufReadWriter(conn),
 	}
 	if err := i.parseRequest(); err != nil {
 		return nil, err
diff --git a/protocol/trojan/outbound.go b/protocol/trojan/outbound.go
index bd93cc023..d459f1d58 100644
--- a/protocol/trojan/outbound.go
+++ b/protocol/trojan/outbound.go
@@ -14,19 +14,21 @@ type TrojanOutboundConnSession struct {
 	protocol.ConnSession
 	config     *conf.GlobalConfig
 	conn       io.ReadWriteCloser
+	bufReader  *bufio.ReadWriter
 	request    *protocol.Request
 	uploaded   int
 	downloaded int
 }
 
 func (o *TrojanOutboundConnSession) Write(p []byte) (int, error) {
-	n, err := o.conn.Write(p)
+	n, err := o.bufReader.Write(p)
+	o.bufReader.Flush()
 	o.uploaded += n
 	return n, err
 }
 
 func (o *TrojanOutboundConnSession) Read(p []byte) (int, error) {
-	n, err := o.conn.Read(p)
+	n, err := o.bufReader.Read(p)
 	o.downloaded += n
 	return n, err
 }
@@ -70,9 +72,10 @@ func NewOutboundConnSession(req *protocol.Request, conn io.ReadWriteCloser, conf
 		conn = tlsConn
 	}
 	o := &TrojanOutboundConnSession{
-		request: req,
-		config:  config,
-		conn:    conn,
+		request:   req,
+		config:    config,
+		conn:      conn,
+		bufReader: common.NewBufReadWriter(conn),
 	}
 	if err := o.writeRequest(); err != nil {
 		return nil, common.NewError("failed to write request").Base(err)