diff --git a/conf/config.ini b/conf/config.ini
index 5a468bd7..13729497 100644
--- a/conf/config.ini
+++ b/conf/config.ini
@@ -294,6 +294,9 @@ port=9000
 #srt 协议中延迟缓存的估算参数，在握手阶段估算rtt ,然后latencyMul*rtt 为最大缓存时长，此参数越大，表示等待重传的时长就越大
 latencyMul=4
 
+#包缓存的大小
+pktBufSize=8192
+
 
 [rtsp]
 #rtsp专有鉴权方式是采用base64还是md5方式
diff --git a/srt/SrtTransport.cpp b/srt/SrtTransport.cpp
index 4714bc64..f30efb83 100644
--- a/srt/SrtTransport.cpp
+++ b/srt/SrtTransport.cpp
@@ -12,6 +12,7 @@ const std::string kTimeOutSec = SRT_FIELD "timeoutSec";
 // srt 单端口udp服务器
 const std::string kPort = SRT_FIELD "port";
 const std::string kLatencyMul = SRT_FIELD "latencyMul";
+const std::string kPktBufSize = SRT_FIELD "pktBufSize";
 
 static std::atomic<uint32_t> s_srt_socket_id_generate { 125 };
 ////////////  SrtTransport //////////////////////////
@@ -207,8 +208,8 @@ void SrtTransport::handleHandshakeConclusion(HandshakePacket &pkt, struct sockad
         sendControlPacket(res, true);
         TraceL << " buf size = " << res->max_flow_window_size << " init seq =" << _init_seq_number
                << " latency=" << delay;
-        _recv_buf = std::make_shared<PacketQueue>(res->max_flow_window_size, _init_seq_number, delay * 1e3);
-        _send_buf = std::make_shared<PacketSendQueue>(res->max_flow_window_size, delay * 1e3);
+        _recv_buf = std::make_shared<PacketQueue>(getPktBufSize(), _init_seq_number, delay * 1e3);
+        _send_buf = std::make_shared<PacketSendQueue>(getPktBufSize(), delay * 1e3);
         _send_packet_seq_number = _init_seq_number;
         _buf_delay = delay;
         onHandShakeFinished(_stream_id, addr);
diff --git a/srt/SrtTransport.hpp b/srt/SrtTransport.hpp
index 27281063..eae99100 100644
--- a/srt/SrtTransport.hpp
+++ b/srt/SrtTransport.hpp
@@ -23,6 +23,7 @@ using namespace toolkit;
 extern const std::string kPort;
 extern const std::string kTimeOutSec;
 extern const std::string kLatencyMul;
+extern const std::string kPktBufSize;
 
 class SrtTransport : public std::enable_shared_from_this<SrtTransport> {
 public:
@@ -55,6 +56,7 @@ protected:
     virtual void onHandShakeFinished(std::string &streamid, struct sockaddr_storage *addr) {};
     virtual void sendPacket(Buffer::Ptr pkt, bool flush = true);
     virtual int getLatencyMul() { return 4; };
+    virtual int getPktBufSize() { return 8192; };
 
 private:
     void registerSelf();
diff --git a/srt/SrtTransportImp.cpp b/srt/SrtTransportImp.cpp
index 275b3ba3..1eb716c4 100644
--- a/srt/SrtTransportImp.cpp
+++ b/srt/SrtTransportImp.cpp
@@ -326,4 +326,10 @@ int SrtTransportImp::getLatencyMul() {
     return latencyMul;
 }
 
+int SrtTransportImp::getPktBufSize() {
+    // kPktBufSize
+    GET_CONFIG(int, pktBufSize, kPktBufSize);
+    return pktBufSize;
+}
+
 } // namespace SRT
\ No newline at end of file
diff --git a/srt/SrtTransportImp.hpp b/srt/SrtTransportImp.hpp
index e9df2024..73ee4a67 100644
--- a/srt/SrtTransportImp.hpp
+++ b/srt/SrtTransportImp.hpp
@@ -36,6 +36,7 @@ public:
 protected:
     ///////SrtTransport override///////
     int getLatencyMul() override;
+    int getPktBufSize() override;
     void onSRTData(DataPacket::Ptr pkt) override;
     void onShutdown(const SockException &ex) override;
     void onHandShakeFinished(std::string &streamid, struct sockaddr_storage *addr) override;