diff --git a/CHANGELOG b/CHANGELOG
index 58eff61..d981466 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,6 +1,7 @@
 proxy更新日志
 v6.4
 1.http(s)代理增加了--jumper参数,可以穿透外部代理连接上级.
+2.优化了socks5代理UDP功能可能存在的内存占用过多问题.
 
 v6.3
 1.fixed #156
diff --git a/services/socks/udp.go b/services/socks/udp.go
index 5d9ebd1..582024b 100644
--- a/services/socks/udp.go
+++ b/services/socks/udp.go
@@ -174,9 +174,9 @@ func (s *Socks) proxyUDP(inConn *net.Conn, serverConn *socks.ServerConn) {
 	}
 	s.log.Printf("use proxy %v : udp %s", useProxy, serverConn.Target())
 	//relay
+	buf := utils.LeakyBuffer.Get()
+	defer utils.LeakyBuffer.Put(buf)
 	for {
-		buf := utils.LeakyBuffer.Get()
-		defer utils.LeakyBuffer.Put(buf)
 		n, srcAddr, err := udpListener.ReadFromUDP(buf)
 		if err != nil {
 			s.log.Printf("udp listener read fail, %s", err.Error())
diff --git a/services/sps/socksudp.go b/services/sps/socksudp.go
index cc52f38..5a58eb4 100644
--- a/services/sps/socksudp.go
+++ b/services/sps/socksudp.go
@@ -126,9 +126,9 @@ func (s *SPS) proxyUDP(inConn *net.Conn, serverConn *socks.ServerConn) {
 	//s.log.Printf("parent udp address %s", client.UDPAddr)
 	destAddr, _ = net.ResolveUDPAddr("udp", client.UDPAddr)
 	//relay
+	buf := utils.LeakyBuffer.Get()
+	defer utils.LeakyBuffer.Put(buf)
 	for {
-		buf := utils.LeakyBuffer.Get()
-		defer utils.LeakyBuffer.Put(buf)
 		n, srcAddr, err := udpListener.ReadFromUDP(buf)
 		if err != nil {
 			s.log.Printf("udp listener read fail, %s", err.Error())
diff --git a/services/sps/ssudp.go b/services/sps/ssudp.go
index 9eccf1e..a3dd71a 100644
--- a/services/sps/ssudp.go
+++ b/services/sps/ssudp.go
@@ -27,9 +27,9 @@ func (s *SPS) RunSSUDP(addr string) (err error) {
 				s.log.Printf("udp local->out io copy crashed:\n%s\n%s", e, string(debug.Stack()))
 			}
 		}()
+		buf := utils.LeakyBuffer.Get()
+		defer utils.LeakyBuffer.Put(buf)
 		for {
-			buf := utils.LeakyBuffer.Get()
-			defer utils.LeakyBuffer.Put(buf)
 			n, srcAddr, err := listener.ReadFrom(buf)
 			if err != nil {
 				s.log.Printf("read from client error %s", err)