diff --git a/include/libs/transport/trpc.h b/include/libs/transport/trpc.h
index de3c2a9f52..ff68b72fc2 100644
--- a/include/libs/transport/trpc.h
+++ b/include/libs/transport/trpc.h
@@ -112,6 +112,8 @@ typedef struct SRpcInit {
   // fail fast fp
   RpcFFfp ffp;
 
+  int32_t connLimit;
+
   void *parent;
 } SRpcInit;
 
diff --git a/source/dnode/mgmt/node_mgmt/src/dmTransport.c b/source/dnode/mgmt/node_mgmt/src/dmTransport.c
index dcb63f6524..dc539ac15e 100644
--- a/source/dnode/mgmt/node_mgmt/src/dmTransport.c
+++ b/source/dnode/mgmt/node_mgmt/src/dmTransport.c
@@ -284,6 +284,8 @@ int32_t dmInitClient(SDnode *pDnode) {
   rpcInit.failFastThreshold = 3;    // failed threshold
   rpcInit.ffp = dmFailFastFp;
 
+  rpcInit.connLimit = 7500;
+
   pTrans->clientRpc = rpcOpen(&rpcInit);
   if (pTrans->clientRpc == NULL) {
     dError("failed to init dnode rpc client");
diff --git a/source/libs/transport/inc/transportInt.h b/source/libs/transport/inc/transportInt.h
index 2db4a72795..92477bb514 100644
--- a/source/libs/transport/inc/transportInt.h
+++ b/source/libs/transport/inc/transportInt.h
@@ -64,6 +64,7 @@ typedef struct {
   void (*destroyFp)(void* ahandle);
   bool (*failFastFp)(tmsg_t msgType);
 
+  int32_t       connLimit;
   int           index;
   void*         parent;
   void*         tcphandle;  // returned handle from TCP initialization
diff --git a/source/libs/transport/src/trans.c b/source/libs/transport/src/trans.c
index 47b1ac5ca7..61ca9743b3 100644
--- a/source/libs/transport/src/trans.c
+++ b/source/libs/transport/src/trans.c
@@ -67,6 +67,7 @@ void* rpcOpen(const SRpcInit* pInit) {
   pRpc->startTimer = pInit->tfp;
   pRpc->destroyFp = pInit->dfp;
   pRpc->failFastFp = pInit->ffp;
+  pRpc->connLimit = pInit->connLimit;
 
   pRpc->numOfThreads = pInit->numOfThreads > TSDB_MAX_RPC_THREADS ? TSDB_MAX_RPC_THREADS : pInit->numOfThreads;
   if (pRpc->numOfThreads <= 0) {
diff --git a/source/libs/transport/src/transCli.c b/source/libs/transport/src/transCli.c
index d8ea21c335..dfbc8a5af2 100644
--- a/source/libs/transport/src/transCli.c
+++ b/source/libs/transport/src/transCli.c
@@ -80,6 +80,7 @@ typedef struct SCliThrd {
   uint64_t      nextTimeout;  // next timeout
   void*         pTransInst;   //
 
+  int connCount;
   void (*destroyAhandleFp)(void* ahandle);
   SHashObj* fqdn2ipCache;
   SCvtAddr  cvtAddr;
@@ -671,7 +672,6 @@ static SCliConn* cliCreateConn(SCliThrd* pThrd) {
   conn->stream = (uv_stream_t*)taosMemoryMalloc(sizeof(uv_tcp_t));
   uv_tcp_init(pThrd->loop, (uv_tcp_t*)(conn->stream));
   conn->stream->data = conn;
-  // transSetConnOption((uv_tcp_t*)conn->stream);
 
   uv_timer_t* timer = taosArrayGetSize(pThrd->timerList) > 0 ? *(uv_timer_t**)taosArrayPop(pThrd->timerList) : NULL;
   if (timer == NULL) {
@@ -694,6 +694,7 @@ static SCliConn* cliCreateConn(SCliThrd* pThrd) {
   conn->broken = 0;
   transRefCliHandle(conn);
 
+  atomic_add_fetch_32(&pThrd->connCount, 1);
   allocConnRef(conn, false);
 
   return conn;
@@ -738,6 +739,8 @@ static void cliDestroy(uv_handle_t* handle) {
     conn->timer = NULL;
   }
 
+  atomic_sub_fetch_32(&pThrd->connCount, 1);
+
   transReleaseExHandle(transGetRefMgt(), conn->refId);
   transRemoveExHandle(transGetRefMgt(), conn->refId);
   taosMemoryFree(conn->ip);
@@ -1861,6 +1864,13 @@ int transSendRequest(void* shandle, const SEpSet* pEpSet, STransMsg* pReq, STran
     return TSDB_CODE_RPC_BROKEN_LINK;
   }
 
+  // read only
+  if (pTransInst->connLimit != 0 && atomic_load_32(&pThrd->connCount) >= pTransInst->connLimit) {
+    transFreeMsg(pReq->pCont);
+    transReleaseExHandle(transGetInstMgt(), (int64_t)shandle);
+    return TSDB_CODE_RPC_MAX_SESSIONS;
+  }
+
   TRACE_SET_MSGID(&pReq->info.traceId, tGenIdPI64());
 
   STransConnCtx* pCtx = taosMemoryCalloc(1, sizeof(STransConnCtx));
@@ -1902,6 +1912,13 @@ int transSendRecv(void* shandle, const SEpSet* pEpSet, STransMsg* pReq, STransMs
     transReleaseExHandle(transGetInstMgt(), (int64_t)shandle);
     return TSDB_CODE_RPC_BROKEN_LINK;
   }
+  // not limit sync req
+  // read only
+  // if (pTransInst->connLimit != 0 && atomic_load_32(&pThrd->connCount) >= pTransInst->connLimit) {
+  //  transFreeMsg(pReq->pCont);
+  //  transReleaseExHandle(transGetInstMgt(), (int64_t)shandle);
+  //    return TSDB_CODE_RPC_MAX_SESSIONS;
+  //}
 
   tsem_t* sem = taosMemoryCalloc(1, sizeof(tsem_t));
   tsem_init(sem, 0, 0);
diff --git a/source/util/src/terror.c b/source/util/src/terror.c
index 57b1998155..c07fa88af5 100644
--- a/source/util/src/terror.c
+++ b/source/util/src/terror.c
@@ -52,6 +52,7 @@ TAOS_DEFINE_ERROR(TSDB_CODE_RPC_PORT_EADDRINUSE,          "Port already in use")
 TAOS_DEFINE_ERROR(TSDB_CODE_RPC_BROKEN_LINK,              "Conn is broken")
 TAOS_DEFINE_ERROR(TSDB_CODE_RPC_TIMEOUT,                  "Conn read timeout")
 TAOS_DEFINE_ERROR(TSDB_CODE_RPC_SOMENODE_NOT_CONNECTED,   "some vnode/qnode/mnode(s) out of service")
+TAOS_DEFINE_ERROR(TSDB_CODE_RPC_MAX_SESSIONS,             "rpc open too many session")
 
 //common & util
 TAOS_DEFINE_ERROR(TSDB_CODE_TIME_UNSYNCED,                "Client and server's time is not synchronized")