diff --git a/CMakeLists.txt b/CMakeLists.txt
index c3a6264..d727f48 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -101,7 +101,13 @@ target_sources(
 
 target_link_libraries(
   sled
-  PUBLIC rpc_core fmt marl Async++ minilua protobuf::libprotobuf
+  PUBLIC rpc_core
+         fmt
+         marl
+         Async++
+         minilua
+         protobuf::libprotobuf
+         tcmalloc_and_profiler_static
          # protobuf::libprotoc
   PRIVATE dl
   # protobuf::libprotobuf ${WHOLE_ARCHIVE_WRAPPER_START}
diff --git a/src/sled/network/kcp/kcp.h b/src/sled/network/kcp/kcp.h
new file mode 100644
index 0000000..a329eec
--- /dev/null
+++ b/src/sled/network/kcp/kcp.h
@@ -0,0 +1,52 @@
+#ifndef SLED_NETWORK_KCP_KCP_H
+#define SLED_NETWORK_KCP_KCP_H
+
+#pragma once
+
+#include <string>
+#include <unistd.h>
+
+/**
+ kcp header
+0               4   5   6       8 (BYTE)
++---------------+---+---+-------+
+|     conv      |cmd|frg|  wnd  |
++---------------+---+---+-------+   8
+|     ts        |     sn        |
++---------------+---------------+  16
+|     una       |     len       |
++---------------+---------------+  24
+|                               |
+|        DATA (optional)        |
+|                               |
++-------------------------------+
+*/
+namespace sled {
+
+enum class KCPCommand {
+    kPush,
+    kAck,
+    kWask,
+    kWins,
+};
+
+struct KCPHeader {
+    uint32_t conv;// conv id
+    uint8_t cmd;  // Command
+    uint8_t frg;  // fragment number
+    uint16_t wnd; // my available window size
+
+    uint32_t ts; // timestamp
+    uint32_t sn; // sequence number
+    uint32_t una;// sender unacknowledged (min) number
+    uint32_t len;// data len
+};
+
+struct KCPPacket {
+    KCPHeader header;
+    char data[1];
+};
+
+}// namespace sled
+
+#endif// SLED_NETWORK_KCP_KCP_H