diff --git a/source/libs/transport/inc/transComm.h b/source/libs/transport/inc/transComm.h
index 4d3a1b70cbd713bce8f06986882f50f46889faa9..c760acd52e80443d2a4bb7b5874ce7258e687798 100644
--- a/source/libs/transport/inc/transComm.h
+++ b/source/libs/transport/inc/transComm.h
@@ -201,4 +201,11 @@ bool transDecompressMsg(char* msg, int32_t len, int32_t* flen);
 
 void transConnCtxDestroy(STransConnCtx* ctx);
 
+typedef struct SConnBuffer {
+  char* buf;
+  int   len;
+  int   cap;
+  int   left;
+} SConnBuffer;
+
 #endif
diff --git a/source/libs/transport/src/trans.c b/source/libs/transport/src/trans.c
index 48398316f1ea19c24bbbfb4e551ff632a621bc6b..cf1e1539654347933898860548cd984cd188d1a9 100644
--- a/source/libs/transport/src/trans.c
+++ b/source/libs/transport/src/trans.c
@@ -17,13 +17,6 @@
 
 #include "transComm.h"
 
-typedef struct SConnBuffer {
-  char* buf;
-  int   len;
-  int   cap;
-  int   left;
-} SConnBuffer;
-
 void* (*taosInitHandle[])(uint32_t ip, uint32_t port, char* label, int numOfThreads, void* fp, void* shandle) = {
     taosInitServer, taosInitClient};
 void (*taosCloseHandle[])(void* arg) = {taosCloseServer, taosCloseClient};
@@ -46,10 +39,11 @@ void* rpcOpen(const SRpcInit* pInit) {
 void rpcClose(void* arg) {
   SRpcInfo* pRpc = (SRpcInfo*)arg;
   (*taosCloseHandle[pRpc->connType])(pRpc->tcphandle);
+  free(pRpc);
   return;
 }
 void* rpcMallocCont(int contLen) {
-  int size = contLen + RPC_MSG_OVERHEAD;
+  int size = contLen + TRANS_MSG_OVERHEAD;
 
   char* start = (char*)calloc(1, (size_t)size);
   if (start == NULL) {
diff --git a/source/libs/transport/src/transCli.c b/source/libs/transport/src/transCli.c
index c96a0f81e05e01a40fc6c4d34b909d5b4beb6888..86e9c05ccb541f17261d4aec80bd007e36cd34db 100644
--- a/source/libs/transport/src/transCli.c
+++ b/source/libs/transport/src/transCli.c
@@ -21,6 +21,7 @@ typedef struct SCliConn {
   uv_connect_t connReq;
   uv_stream_t* stream;
   uv_write_t*  writeReq;
+  SConnBuffer  readBuf;
   void*        data;
   queue        conn;
   char         spi;
@@ -55,9 +56,17 @@ typedef struct SClientObj {
 static SCliConn* getConnFromCache(void* cache, char* ip, uint32_t port);
 static void      addConnToCache(void* cache, char* ip, uint32_t port, SCliConn* conn);
 
+// process data read from server, auth/decompress etc
+static void clientProcessData(SCliConn* conn);
+// check whether already read complete packet from server
+static bool clientReadComplete(SConnBuffer* pBuf);
+// alloc buf for read
 static void clientAllocBufferCb(uv_handle_t* handle, size_t suggested_size, uv_buf_t* buf);
+// callback after read nbytes from socket
 static void clientReadCb(uv_stream_t* cli, ssize_t nread, const uv_buf_t* buf);
+// callback after write data to socket
 static void clientWriteCb(uv_write_t* req, int status);
+// callback after conn  to server
 static void clientConnCb(uv_connect_t* req, int status);
 static void clientAsyncCb(uv_async_t* handle);
 static void clientDestroy(uv_handle_t* handle);
@@ -67,18 +76,72 @@ static void clientMsgDestroy(SCliMsg* pMsg);
 
 static void* clientThread(void* arg);
 
+static void clientProcessData(SCliConn* conn) {
+  // impl
+}
 static void clientHandleReq(SCliMsg* pMsg, SCliThrdObj* pThrd);
 
+static bool clientReadComplete(SConnBuffer* data) {
+  STransMsgHead head;
+  int32_t       headLen = sizeof(head);
+  if (data->len >= headLen) {
+    memcpy((char*)&head, data->buf, headLen);
+    int32_t msgLen = (int32_t)htonl((uint32_t)head.msgLen);
+    if (msgLen > data->len) {
+      data->left = msgLen - data->len;
+      return false;
+    } else {
+      return true;
+    }
+  } else {
+    return false;
+  }
+}
 static void clientAllocReadBufferCb(uv_handle_t* handle, size_t suggested_size, uv_buf_t* buf) {
   // impl later
+  static const int CAPACITY = 512;
+
+  SCliConn*    conn = handle->data;
+  SConnBuffer* pBuf = &conn->readBuf;
+  if (pBuf->cap == 0) {
+    pBuf->buf = (char*)calloc(CAPACITY, sizeof(char));
+    pBuf->len = 0;
+    pBuf->cap = CAPACITY;
+    pBuf->left = -1;
+    buf->base = pBuf->buf;
+    buf->len = CAPACITY;
+  } else {
+    if (pBuf->len >= pBuf->cap) {
+      if (pBuf->left == -1) {
+        pBuf->cap *= 2;
+        pBuf->buf = realloc(pBuf->buf, pBuf->cap);
+      } else if (pBuf->len + pBuf->left > pBuf->cap) {
+        pBuf->cap = pBuf->len + pBuf->left;
+        pBuf->buf = realloc(pBuf->buf, pBuf->len + pBuf->left);
+      }
+    }
+    buf->base = pBuf->buf + pBuf->len;
+    buf->len = pBuf->cap - pBuf->len;
+  }
 }
 static void clientReadCb(uv_stream_t* handle, ssize_t nread, const uv_buf_t* buf) {
   // impl later
-  SCliConn* conn = handle->data;
+  SCliConn*    conn = handle->data;
+  SConnBuffer* pBuf = &conn->readBuf;
   if (nread > 0) {
+    pBuf->len += nread;
+    if (clientReadComplete(pBuf)) {
+      tDebug("alread read complete pack");
+      clientProcessData(conn);
+    } else {
+      tDebug("read halp packet, continue to read");
+    }
     return;
   }
 
+  if (nread != UV_EOF) {
+    tDebug("Read error %s\n", uv_err_name(nread));
+  }
   //
   uv_close((uv_handle_t*)handle, clientDestroy);
 }
@@ -166,7 +229,7 @@ static void clientHandleReq(SCliMsg* pMsg, SCliThrdObj* pThrd) {
     conn->writeReq->data = conn;
     clientWrite(conn);
   } else {
-    SCliConn* conn = malloc(sizeof(SCliConn));
+    SCliConn* conn = calloc(1, sizeof(SCliConn));
 
     conn->stream = (uv_stream_t*)malloc(sizeof(uv_tcp_t));
     uv_tcp_init(pThrd->loop, (uv_tcp_t*)(conn->stream));
@@ -248,6 +311,7 @@ void taosCloseClient(void* arg) {
     SCliThrdObj* pThrd = cli->pThreadObj[i];
     pthread_join(pThrd->thread, NULL);
     pthread_mutex_destroy(&pThrd->msgMtx);
+    free(pThrd->cliAsync);
     free(pThrd->loop);
     free(pThrd);
   }
diff --git a/source/libs/transport/src/transSrv.c b/source/libs/transport/src/transSrv.c
index f4625dc0b3ca2fccd58edcef6b80541a2aa97af8..d096ab78139efaf9e613ddaf7be1bc63b4689192 100644
--- a/source/libs/transport/src/transSrv.c
+++ b/source/libs/transport/src/transSrv.c
@@ -16,13 +16,6 @@
 #ifdef USE_UV
 #include "transComm.h"
 
-typedef struct SConnBuffer {
-  char* buf;
-  int   len;
-  int   cap;
-  int   left;
-} SConnBuffer;
-
 typedef struct SConn {
   uv_tcp_t*   pTcp;
   uv_write_t* pWriter;
@@ -100,7 +93,8 @@ static void* acceptThread(void* arg);
 void uvAllocReadBufferCb(uv_handle_t* handle, size_t suggested_size, uv_buf_t* buf) {
   /*
    * formate of data buffer:
-   * |<-------SRpcReqContext------->|<------------data read from socket----------->|
+   * |<--------------------------data from socket------------------------------->|
+   * |<------STransMsgHead------->|<-------------------other data--------------->|
    */
   static const int CAPACITY = 1024;
 
@@ -133,7 +127,6 @@ void uvAllocReadBufferCb(uv_handle_t* handle, size_t suggested_size, uv_buf_t* b
 //
 static bool readComplete(SConnBuffer* data) {
   // TODO(yihao): handle pipeline later
-  // SRpcHead rpcHead;
   STransMsgHead head;
   int32_t       headLen = sizeof(head);
   if (data->len >= headLen) {
@@ -270,13 +263,13 @@ static void uvProcessData(SConn* pConn) {
 
 void uvOnReadCb(uv_stream_t* cli, ssize_t nread, const uv_buf_t* buf) {
   // opt
-  SConn*       ctx = cli->data;
-  SConnBuffer* pBuf = &ctx->connBuf;
+  SConn*       conn = cli->data;
+  SConnBuffer* pBuf = &conn->connBuf;
   if (nread > 0) {
     pBuf->len += nread;
     if (readComplete(pBuf)) {
       tDebug("alread read complete packet");
-      uvProcessData(ctx);
+      uvProcessData(conn);
     } else {
       tDebug("read half packet, continue to read");
     }
@@ -542,6 +535,7 @@ void taosCloseServer(void* arg) {
   free(srv->pipe);
   free(srv->pThreadObj);
   pthread_join(srv->thread, NULL);
+  free(srv);
 }
 
 void rpcSendResponse(const SRpcMsg* pMsg) {