diff --git a/srt/Common.hpp b/srt/Common.hpp
index 81d98814..de5d3aaa 100644
--- a/srt/Common.hpp
+++ b/srt/Common.hpp
@@ -1,9 +1,10 @@
 #ifndef ZLMEDIAKIT_SRT_COMMON_H
 #define ZLMEDIAKIT_SRT_COMMON_H
 #if defined(_WIN32)
-#include <Iphlpapi.h>
 #include <winsock2.h>
 #include <ws2tcpip.h>
+
+#include <Iphlpapi.h>
 #pragma comment(lib, "Ws2_32.lib")
 #pragma comment(lib, "Iphlpapi.lib")
 #else
diff --git a/srt/Packet.cpp b/srt/Packet.cpp
index b4afbf4a..85de1cbf 100644
--- a/srt/Packet.cpp
+++ b/srt/Packet.cpp
@@ -294,8 +294,12 @@ bool HandshakePacket::loadExtMessage(uint8_t *buf, size_t len) {
         length = loadUint16(ptr + 2);
         switch (type) {
         case HSExt::SRT_CMD_HSREQ:
-        case HSExt::SRT_CMD_HSRSP: ext = std::make_shared<HSExtMessage>(); break;
-        case HSExt::SRT_CMD_SID: ext = std::make_shared<HSExtStreamID>(); break;
+        case HSExt::SRT_CMD_HSRSP:
+            ext = std::make_shared<HSExtMessage>();
+            break;
+        case HSExt::SRT_CMD_SID:
+            ext = std::make_shared<HSExtStreamID>();
+            break;
         default:
             WarnL << "not support ext " << type;
             break;
@@ -410,7 +414,7 @@ void HandshakePacket::assignPeerIP(struct sockaddr_storage *addr) {
     memset(peer_ip_addr, 0, sizeof(peer_ip_addr) * sizeof(peer_ip_addr[0]));
     if (addr->ss_family == AF_INET) {
         struct sockaddr_in *ipv4 = (struct sockaddr_in *)addr;
-        //抓包 奇怪好像是小头端？？？
+        // 抓包 奇怪好像是小头端？？？
         storeUint32LE(peer_ip_addr, ipv4->sin_addr.s_addr);
     } else if (addr->ss_family == AF_INET6) {
         if (IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)addr)->sin6_addr)) {
diff --git a/srt/SrtTransport.cpp b/srt/SrtTransport.cpp
index 570e09f8..4714bc64 100644
--- a/srt/SrtTransport.cpp
+++ b/srt/SrtTransport.cpp
@@ -127,6 +127,8 @@ void SrtTransport::handleHandshakeInduction(HandshakePacket &pkt, struct sockadd
     _max_window_size = pkt.max_flow_window_size;
     _mtu = pkt.mtu;
 
+    _last_pkt_seq = _init_seq_number - 1;
+
     _peer_socket_id = pkt.srt_socket_id;
     HandshakePacket::Ptr res = std::make_shared<HandshakePacket>();
     res->dst_socket_id = _peer_socket_id;
@@ -318,6 +320,10 @@ void SrtTransport::handleDropReq(uint8_t *buf, int len, struct sockaddr_storage
     uint32_t max_seq = 0;
     for (auto data : list) {
         max_seq = data->packet_seq_number;
+        if (_last_pkt_seq + 1 != data->packet_seq_number) {
+            TraceL << "pkt lost " << _last_pkt_seq + 1 << "->" << data->packet_seq_number;
+        }
+        _last_pkt_seq = data->packet_seq_number;
         onSRTData(std::move(data));
     }
     _recv_nack.drop(max_seq);
@@ -454,6 +460,10 @@ void SrtTransport::handleDataPacket(uint8_t *buf, int len, struct sockaddr_stora
         uint32_t last_seq;
         for (auto data : list) {
             last_seq = data->packet_seq_number;
+            if (_last_pkt_seq + 1 != data->packet_seq_number) {
+                TraceL << "pkt lost " << _last_pkt_seq + 1 << "->" << data->packet_seq_number;
+            }
+            _last_pkt_seq = data->packet_seq_number;
             onSRTData(std::move(data));
         }
         _recv_nack.drop(last_seq);
diff --git a/srt/SrtTransport.hpp b/srt/SrtTransport.hpp
index 43ae841f..27281063 100644
--- a/srt/SrtTransport.hpp
+++ b/srt/SrtTransport.hpp
@@ -125,6 +125,8 @@ private:
     uint32_t _light_ack_pkt_count = 0;
     uint32_t _ack_number_count = 0;
     uint32_t _last_ack_pkt_seq_num = 0;
+
+    uint32_t _last_pkt_seq = 0;
     UTicker _ack_ticker;
     std::map<uint32_t, TimePoint> _ack_send_timestamp;