diff --git a/source/libs/transport/inc/transComm.h b/source/libs/transport/inc/transComm.h
index f256c96037..a81d6db80f 100644
--- a/source/libs/transport/inc/transComm.h
+++ b/source/libs/transport/inc/transComm.h
@@ -7,8 +7,7 @@
  *
  * This program is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.
- *
+ * FITNESS FOR A PARTICULAR PURPOSE.  *
  * You should have received a copy of the GNU Affero General Public License
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
@@ -211,6 +210,7 @@ typedef struct SConnBuffer {
   char* buf;
   int   len;
   int   cap;
+  int   left;
   int   total;
 } SConnBuffer;
 
@@ -282,6 +282,8 @@ int  transClearBuffer(SConnBuffer* buf);
 int  transDestroyBuffer(SConnBuffer* buf);
 int  transAllocBuffer(SConnBuffer* connBuf, uv_buf_t* uvBuf);
 bool transReadComplete(SConnBuffer* connBuf);
+int  transResetBuffer(SConnBuffer* connBuf);
+int  transDumpFromBuffer(SConnBuffer* connBuf, char** buf);
 
 int transSetConnOption(uv_tcp_t* stream);
 
diff --git a/source/libs/transport/src/thttp.c b/source/libs/transport/src/thttp.c
index c747e69339..ce9c6fb306 100644
--- a/source/libs/transport/src/thttp.c
+++ b/source/libs/transport/src/thttp.c
@@ -17,10 +17,10 @@
 #ifdef USE_UV
 #include <uv.h>
 #endif
-#include "zlib.h"
-#include "thttp.h"
 #include "taoserror.h"
+#include "thttp.h"
 #include "tlog.h"
+#include "zlib.h"
 
 static int32_t taosBuildHttpHeader(const char* server, int32_t contLen, char* pHead, int32_t headLen,
                                    EHttpCompFlag flag) {
@@ -174,7 +174,7 @@ int32_t taosSendHttpReport(const char* server, uint16_t port, char* pCont, int32
 
 #else
 int32_t taosSendHttpReport(const char* server, uint16_t port, char* pCont, int32_t contLen, EHttpCompFlag flag) {
-  int32_t code = -1;
+  int32_t     code = -1;
   TdSocketPtr pSocket = NULL;
 
   uint32_t ip = taosGetIpv4FromFqdn(server);
@@ -231,4 +231,4 @@ SEND_OVER:
   return code;
 }
 
-#endif
\ No newline at end of file
+#endif
diff --git a/source/libs/transport/src/transCli.c b/source/libs/transport/src/transCli.c
index 70d56dca13..54ffcabc8d 100644
--- a/source/libs/transport/src/transCli.c
+++ b/source/libs/transport/src/transCli.c
@@ -323,7 +323,8 @@ void cliHandleResp(SCliConn* conn) {
   SCliThrd* pThrd = conn->hostThrd;
   STrans*   pTransInst = pThrd->pTransInst;
 
-  STransMsgHead* pHead = (STransMsgHead*)(conn->readBuf.buf);
+  STransMsgHead* pHead = NULL;
+  transDumpFromBuffer(&conn->readBuf, (char**)&pHead);
   pHead->code = htonl(pHead->code);
   pHead->msgLen = htonl(pHead->msgLen);
 
@@ -366,7 +367,6 @@ void cliHandleResp(SCliConn* conn) {
     }
   }
   // buf's mem alread translated to transMsg.pCont
-  transClearBuffer(&conn->readBuf);
   if (!CONN_NO_PERSIST_BY_APP(conn)) {
     transMsg.info.handle = (void*)conn->refId;
     tDebug("%s conn %p ref by app", CONN_GET_INST_LABEL(conn), conn);
@@ -636,6 +636,8 @@ static SCliConn* cliCreateConn(SCliThrd* pThrd) {
   transReqQueueInit(&conn->wreqQueue);
 
   transQueueInit(&conn->cliMsgs, NULL);
+
+  transInitBuffer(&conn->readBuf);
   QUEUE_INIT(&conn->q);
   conn->hostThrd = pThrd;
   conn->status = ConnNormal;
@@ -651,8 +653,9 @@ static void cliDestroyConn(SCliConn* conn, bool clear) {
   QUEUE_REMOVE(&conn->q);
   QUEUE_INIT(&conn->q);
   transRemoveExHandle(transGetRefMgt(), conn->refId);
-  conn->refId = -1;
+  transDestroyBuffer(&conn->readBuf);
 
+  conn->refId = -1;
   if (conn->task != NULL) transDQCancel(((SCliThrd*)conn->hostThrd)->timeoutQueue, conn->task);
 
   if (clear) {
@@ -678,7 +681,6 @@ static void cliDestroy(uv_handle_t* handle) {
   tTrace("%s conn %p destroy successfully", CONN_GET_INST_LABEL(conn), conn);
   transReqQueueClear(&conn->wreqQueue);
 
-  transDestroyBuffer(&conn->readBuf);
   taosMemoryFree(conn);
 }
 static bool cliHandleNoResp(SCliConn* conn) {
diff --git a/source/libs/transport/src/transComm.c b/source/libs/transport/src/transComm.c
index 155cdd1062..fb59aafb33 100644
--- a/source/libs/transport/src/transComm.c
+++ b/source/libs/transport/src/transComm.c
@@ -16,6 +16,8 @@
 
 #include "transComm.h"
 
+#define BUFFER_CAP 4096
+
 static TdThreadOnce transModuleInit = PTHREAD_ONCE_INIT;
 
 static int32_t refMgt;
@@ -111,12 +113,56 @@ int transGetSockDebugInfo(struct sockaddr* sockname, char* dst) {
   return r;
 }
 int transInitBuffer(SConnBuffer* buf) {
-  transClearBuffer(buf);
+  buf->cap = BUFFER_CAP;
+  buf->buf = taosMemoryCalloc(1, BUFFER_CAP);
+  buf->left = -1;
+  buf->len = 0;
+  buf->total = 0;
   return 0;
 }
+int transDestroyBuffer(SConnBuffer* buf) {
+  taosMemoryFree(buf->buf);
+  return 0;
+}
+
 int transClearBuffer(SConnBuffer* buf) {
-  memset(buf, 0, sizeof(*buf));
-  buf->total = -1;
+  SConnBuffer* p = buf;
+  if (p->cap > BUFFER_CAP) {
+    p->cap = BUFFER_CAP;
+    p->buf = taosMemoryRealloc(p->buf, BUFFER_CAP);
+  }
+  p->left = -1;
+  p->len = 0;
+  p->total = 0;
+  return 0;
+}
+
+int transDumpFromBuffer(SConnBuffer* connBuf, char** buf) {
+  SConnBuffer* p = connBuf;
+  if (p->left != 0) {
+    return -1;
+  }
+  int total = connBuf->total;
+  *buf = taosMemoryCalloc(1, total);
+  memcpy(*buf, p->buf, total);
+
+  transResetBuffer(connBuf);
+  return total;
+}
+
+int transResetBuffer(SConnBuffer* connBuf) {
+  SConnBuffer* p = connBuf;
+  if (p->total <= p->len) {
+    int left = p->len - p->total;
+    memmove(p->buf, p->buf + p->total, left);
+    p->left = -1;
+    p->total = 0;
+    p->len = left;
+  } else {
+    p->left = -1;
+    p->total = 0;
+    p->len = 0;
+  }
   return 0;
 }
 int transAllocBuffer(SConnBuffer* connBuf, uv_buf_t* uvBuf) {
@@ -126,54 +172,39 @@ int transAllocBuffer(SConnBuffer* connBuf, uv_buf_t* uvBuf) {
    * |<------STransMsgHead------->|<-------------------userdata--------------->|<-----auth data----->|<----user
    * info--->|
    */
-  static const int CAPACITY = sizeof(STransMsgHead);
-
   SConnBuffer* p = connBuf;
-  if (p->cap == 0) {
-    p->buf = (char*)taosMemoryCalloc(CAPACITY, sizeof(char));
-    tTrace("internal malloc mem:%p, size:%d", p->buf, CAPACITY);
-    p->len = 0;
-    p->cap = CAPACITY;
-    p->total = -1;
 
-    uvBuf->base = p->buf;
-    uvBuf->len = CAPACITY;
-  } else if (p->total == -1 && p->len < CAPACITY) {
-    uvBuf->base = p->buf + p->len;
-    uvBuf->len = CAPACITY - p->len;
-  } else {
-    p->cap = p->total;
-    p->buf = taosMemoryRealloc(p->buf, p->cap);
-    tTrace("internal realloc mem:%p, size:%d", p->buf, p->cap);
-
-    uvBuf->base = p->buf + p->len;
+  uvBuf->base = p->buf + p->len;
+  if (p->left == -1) {
     uvBuf->len = p->cap - p->len;
+  } else {
+    if (p->left < p->cap - p->len) {
+      uvBuf->len = p->left;
+    } else {
+      p->buf = taosMemoryRealloc(p->buf, p->left + p->len);
+      uvBuf->base = p->buf + p->len;
+      uvBuf->len = p->left;
+    }
   }
   return 0;
 }
 // check whether already read complete
 bool transReadComplete(SConnBuffer* connBuf) {
-  if (connBuf->total == -1 && connBuf->len >= sizeof(STransMsgHead)) {
-    STransMsgHead head;
-    memcpy((char*)&head, connBuf->buf, sizeof(head));
-    int32_t msgLen = (int32_t)htonl(head.msgLen);
-    connBuf->total = msgLen;
+  SConnBuffer* p = connBuf;
+  if (p->len >= sizeof(STransMsgHead)) {
+    if (p->left == -1) {
+      STransMsgHead head;
+      memcpy((char*)&head, connBuf->buf, sizeof(head));
+      int32_t msgLen = (int32_t)htonl(head.msgLen);
+      p->total = msgLen;
+    }
+    if (p->total >= p->len) {
+      p->left = p->total - p->len;
+    } else {
+      p->left = 0;
+    }
   }
-  if (connBuf->len == connBuf->cap && connBuf->total == connBuf->cap) {
-    return true;
-  }
-  return false;
-}
-int transPackMsg(STransMsgHead* msgHead, bool sercured, bool auth) { return 0; }
-
-int transUnpackMsg(STransMsgHead* msgHead) { return 0; }
-int transDestroyBuffer(SConnBuffer* buf) {
-  if (buf->cap > 0) {
-    taosMemoryFreeClear(buf->buf);
-  }
-  transClearBuffer(buf);
-
-  return 0;
+  return p->left == 0 ? true : false;
 }
 
 int transSetConnOption(uv_tcp_t* stream) {
diff --git a/source/libs/transport/src/transSvr.c b/source/libs/transport/src/transSvr.c
index fe7ab47fee..e360926b40 100644
--- a/source/libs/transport/src/transSvr.c
+++ b/source/libs/transport/src/transSvr.c
@@ -212,9 +212,10 @@ static void uvHandleActivityTimeout(uv_timer_t* handle) {
 }
 
 static void uvHandleReq(SSvrConn* pConn) {
-  SConnBuffer* pBuf = &pConn->readBuf;
-  char*        msg = pBuf->buf;
-  uint32_t     msgLen = pBuf->len;
+  STransMsgHead* msg = NULL;
+  int            msgLen = 0;
+
+  msgLen = transDumpFromBuffer(&pConn->readBuf, (char**)&msg);
 
   STransMsgHead* pHead = (STransMsgHead*)msg;
   pHead->code = htonl(pHead->code);
@@ -761,6 +762,7 @@ static SSvrConn* createConn(void* hThrd) {
   memset(&pConn->regArg, 0, sizeof(pConn->regArg));
   pConn->broken = false;
   pConn->status = ConnNormal;
+  transInitBuffer(&pConn->readBuf);
 
   SExHandle* exh = taosMemoryMalloc(sizeof(SExHandle));
   exh->handle = pConn;