diff --git a/common/buf/multi_buffer.go b/common/buf/multi_buffer.go
index 23e7b884..e03d950b 100644
--- a/common/buf/multi_buffer.go
+++ b/common/buf/multi_buffer.go
@@ -38,16 +38,13 @@ func ReadAllToBytes(reader io.Reader) ([]byte, error) {
 // MultiBuffer is a list of Buffers. The order of Buffer matters.
 type MultiBuffer []*Buffer
 
-// Append appends buffer to the end of this MultiBuffer
-func (mb *MultiBuffer) Append(buf *Buffer) {
-	if buf != nil {
-		*mb = append(*mb, buf)
+// MergeMulti merges content from src to dest, and returns the new address of dest and src
+func MergeMulti(dest MultiBuffer, src MultiBuffer) (MultiBuffer, MultiBuffer) {
+	dest = append(dest, src...)
+	for idx := range src {
+		src[idx] = nil
 	}
-}
-
-// AppendMulti appends a MultiBuffer to the end of this one.
-func (mb *MultiBuffer) AppendMulti(buf MultiBuffer) {
-	*mb = append(*mb, buf...)
+	return dest, src[:0]
 }
 
 // Copy copied the beginning part of the MultiBuffer into the given byte array.
@@ -73,7 +70,7 @@ func (mb *MultiBuffer) ReadFrom(reader io.Reader) (int64, error) {
 		if b.IsEmpty() {
 			b.Release()
 		} else {
-			mb.Append(b)
+			*mb = append(*mb, b)
 		}
 		totalBytes += int64(b.Len())
 		if err != nil {
@@ -138,7 +135,7 @@ func (mb *MultiBuffer) Write(b []byte) (int, error) {
 		bb := New()
 		nBytes, _ := bb.Write(b)
 		b = b[nBytes:]
-		mb.Append(bb)
+		*mb = append(*mb, bb)
 	}
 
 	return totalBytes, nil
@@ -204,7 +201,7 @@ func (mb *MultiBuffer) SliceBySize(size int32) MultiBuffer {
 			break
 		}
 		sliceSize += b.Len()
-		slice.Append(b)
+		slice = append(slice, b)
 		(*mb)[i] = nil
 	}
 	*mb = (*mb)[endIndex:]
diff --git a/common/buf/multi_buffer_test.go b/common/buf/multi_buffer_test.go
index 494a4fb8..2d329328 100644
--- a/common/buf/multi_buffer_test.go
+++ b/common/buf/multi_buffer_test.go
@@ -33,7 +33,7 @@ func TestMultiBufferAppend(t *testing.T) {
 	var mb MultiBuffer
 	b := New()
 	b.WriteString("ab")
-	mb.Append(b)
+	mb = append(mb, b)
 	assert(mb.Len(), Equals, int32(2))
 }
 
diff --git a/common/buf/readv_test.go b/common/buf/readv_test.go
index 8f8eb2b5..62cb539f 100644
--- a/common/buf/readv_test.go
+++ b/common/buf/readv_test.go
@@ -51,7 +51,7 @@ func TestReadvReader(t *testing.T) {
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
-		rmb.AppendMulti(mb)
+		rmb, _ = MergeMulti(rmb, mb)
 		if rmb.Len() == size {
 			break
 		}
diff --git a/common/crypto/auth.go b/common/crypto/auth.go
index 5236827e..a1202b40 100644
--- a/common/crypto/auth.go
+++ b/common/crypto/auth.go
@@ -176,7 +176,7 @@ func (r *AuthenticationReader) readInternal(soft bool, mb *buf.MultiBuffer) erro
 		if err != nil {
 			return nil
 		}
-		mb.Append(b)
+		*mb = append(*mb, b)
 		return nil
 	}
 
@@ -289,7 +289,7 @@ func (w *AuthenticationWriter) writeStream(mb buf.MultiBuffer) error {
 			mb2Write.Release()
 			return err
 		}
-		mb2Write.Append(eb)
+		mb2Write = append(mb2Write, eb)
 		if mb.IsEmpty() {
 			break
 		}
@@ -313,7 +313,7 @@ func (w *AuthenticationWriter) writePacket(mb buf.MultiBuffer) error {
 			continue
 		}
 
-		mb2Write.Append(eb)
+		mb2Write = append(mb2Write, eb)
 	}
 
 	if mb2Write.IsEmpty() {
diff --git a/common/crypto/auth_test.go b/common/crypto/auth_test.go
index 3e4d367a..b53c99f3 100644
--- a/common/crypto/auth_test.go
+++ b/common/crypto/auth_test.go
@@ -60,7 +60,7 @@ func TestAuthenticationReaderWriter(t *testing.T) {
 		mb2, err := reader.ReadMultiBuffer()
 		assert(err, IsNil)
 
-		mb.AppendMulti(mb2)
+		mb, _ = buf.MergeMulti(mb, mb2)
 	}
 
 	assert(mb.Len(), Equals, int32(payloadSize))
@@ -97,11 +97,11 @@ func TestAuthenticationReaderWriterPacket(t *testing.T) {
 	var payload buf.MultiBuffer
 	pb1 := buf.New()
 	pb1.Write([]byte("abcd"))
-	payload.Append(pb1)
+	payload = append(payload, pb1)
 
 	pb2 := buf.New()
 	pb2.Write([]byte("efgh"))
-	payload.Append(pb2)
+	payload = append(payload, pb2)
 
 	assert(writer.WriteMultiBuffer(payload), IsNil)
 	assert(cache.Len(), GreaterThan, int32(0))
diff --git a/common/crypto/chunk.go b/common/crypto/chunk.go
index 465c21c1..65c5c0f8 100755
--- a/common/crypto/chunk.go
+++ b/common/crypto/chunk.go
@@ -147,8 +147,8 @@ func (w *ChunkStreamWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
 
 		b := buf.New()
 		w.sizeEncoder.Encode(uint16(slice.Len()), b.Extend(w.sizeEncoder.SizeBytes()))
-		mb2Write.Append(b)
-		mb2Write.AppendMulti(slice)
+		mb2Write = append(mb2Write, b)
+		mb2Write = append(mb2Write, slice...)
 
 		if mb.IsEmpty() {
 			break
diff --git a/common/mux/mux_test.go b/common/mux/mux_test.go
index 16dbe7c7..93d073af 100644
--- a/common/mux/mux_test.go
+++ b/common/mux/mux_test.go
@@ -22,7 +22,7 @@ func readAll(reader buf.Reader) (buf.MultiBuffer, error) {
 		if err != nil {
 			return nil, err
 		}
-		mb.AppendMulti(b)
+		mb = append(mb, b...)
 	}
 	return mb, nil
 }
diff --git a/common/mux/writer.go b/common/mux/writer.go
index 72536739..cd6daf1f 100644
--- a/common/mux/writer.go
+++ b/common/mux/writer.go
@@ -71,8 +71,8 @@ func writeMetaWithFrame(writer buf.Writer, meta FrameMetadata, data buf.MultiBuf
 	}
 
 	mb2 := make(buf.MultiBuffer, 0, len(data)+1)
-	mb2.Append(frame)
-	mb2.AppendMulti(data)
+	mb2 = append(mb2, frame)
+	mb2 = append(mb2, data...)
 	return writer.WriteMultiBuffer(mb2)
 }
 
diff --git a/transport/internet/kcp/receiving.go b/transport/internet/kcp/receiving.go
index 000cf197..68815140 100644
--- a/transport/internet/kcp/receiving.go
+++ b/transport/internet/kcp/receiving.go
@@ -196,7 +196,7 @@ func (w *ReceivingWorker) ReadMultiBuffer() buf.MultiBuffer {
 			break
 		}
 		w.nextNumber++
-		mb.Append(seg.Detach())
+		mb = append(mb, seg.Detach())
 		seg.Release()
 	}
 
diff --git a/transport/pipe/impl.go b/transport/pipe/impl.go
index 1484506a..3f15f900 100644
--- a/transport/pipe/impl.go
+++ b/transport/pipe/impl.go
@@ -120,7 +120,7 @@ func (p *pipe) writeMultiBufferInternal(mb buf.MultiBuffer) error {
 		return err
 	}
 
-	p.data.AppendMulti(mb)
+	p.data, _ = buf.MergeMulti(p.data, mb)
 	return nil
 }