diff --git a/src/client/inc/tsclient.h b/src/client/inc/tsclient.h
index 21a7624b2857721f0c41de8c7e7993612cc76ce1..7ce98094206aed3e81cada9b838610ae8f78f6e4 100644
--- a/src/client/inc/tsclient.h
+++ b/src/client/inc/tsclient.h
@@ -307,7 +307,6 @@ typedef struct STscObj {
   SRpcCorEpSet       *tscCorMgmtEpSet;
   void*              pDnodeConn;
   pthread_mutex_t    mutex;
-  T_REF_DECLARE()
 } STscObj;
 
 typedef struct SSubqueryState {
@@ -483,7 +482,6 @@ extern int           tscObjRef;
 extern void *    tscTmr;
 extern void *    tscQhandle;
 extern int       tscKeepConn[];
-extern int       tsInsertHeadSize;
 extern int       tscNumOfThreads;
 extern int       tscRefId;
   
diff --git a/src/client/src/tscSql.c b/src/client/src/tscSql.c
index d7dec2f35643dfb68e66e3d8197f3a735d5a700e..9ad38e33600bdc1c6fb10182ce25f5bd38e936ac 100644
--- a/src/client/src/tscSql.c
+++ b/src/client/src/tscSql.c
@@ -115,9 +115,7 @@ static SSqlObj *taosConnectImpl(const char *ip, const char *user, const char *pa
 
   pObj->signature = pObj;
   pObj->pDnodeConn = pDnodeConn;
-  T_REF_INIT_VAL(pObj, 1);
   
-
   tstrncpy(pObj->user, user, sizeof(pObj->user));
   secretEncryptLen = MIN(secretEncryptLen, sizeof(pObj->pass));
   memcpy(pObj->pass, secretEncrypt, secretEncryptLen);
@@ -172,11 +170,9 @@ static SSqlObj *taosConnectImpl(const char *ip, const char *user, const char *pa
   if (taos != NULL) {
     *taos = pObj;
   }
-
+  pObj->rid = taosAddRef(tscRefId, pObj);
   registerSqlObj(pSql);
-  tsInsertHeadSize = sizeof(SMsgDesc) + sizeof(SSubmitMsg);
 
-  pObj->rid = taosAddRef(tscRefId, pObj);
   return pSql;
 }
 
@@ -288,34 +284,19 @@ void taos_close(TAOS *taos) {
     return;
   }
 
-  // make sure that the close connection can only be executed once.
-  pObj->signature = NULL;
-  taosTmrStopA(&(pObj->pTimer));
-
-  if (pObj->hbrid > 0) {
-    SSqlObj* pHb = (SSqlObj*)taosAcquireRef(tscObjRef, pObj->hbrid);
-    if (pHb != NULL) {
-      if (pHb->rpcRid > 0) {  // wait for rsp from dnode
-        rpcCancelRequest(pHb->rpcRid);
-        pHb->rpcRid = -1;
-      }
-
-      tscDebug("%p HB is freed", pHb);
-      taos_free_result(pHb);
-      taosReleaseRef(tscObjRef, pHb->self);
+  SSqlObj* pHb = (SSqlObj*)taosAcquireRef(tscObjRef, pObj->hbrid);
+  if (pHb != NULL) {
+    if (pHb->rpcRid > 0) {  // wait for rsp from dnode
+      rpcCancelRequest(pHb->rpcRid);
+      pHb->rpcRid = -1;
     }
-  }
-
-  int32_t ref = T_REF_DEC(pObj);
-  assert(ref >= 0);
 
-  if (ref > 0) {
-    tscDebug("%p %d remain sqlObjs, not free tscObj and dnodeConn:%p", pObj, ref, pObj->pDnodeConn);
-    return;
+    tscDebug("%p HB is freed", pHb);
+    taosReleaseRef(tscObjRef, pHb->self);
+    taos_free_result(pHb);
   }
 
   tscDebug("%p all sqlObj are freed, free tscObj and close dnodeConn:%p", pObj, pObj->pDnodeConn);
-
   taosRemoveRef(tscRefId, pObj->rid);
 }
 
diff --git a/src/client/src/tscSystem.c b/src/client/src/tscSystem.c
index 1eddeacc6514356d7a45874c33e9132443a83eca..d98ab2facc62dfc1734150aff93c6e142890dac8 100644
--- a/src/client/src/tscSystem.c
+++ b/src/client/src/tscSystem.c
@@ -36,7 +36,6 @@ int     tscObjRef = -1;
 void *  tscTmr;
 void *  tscQhandle;
 void *  tscCheckDiskUsageTmr;
-int     tsInsertHeadSize;
 int     tscRefId = -1;
 
 int tscNumOfThreads;
diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index 7dfab427b598e5bb2a1edb93f1888b7a8136ed00..95ba2bd849d8aae1209262981855836f85374353 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -460,15 +460,7 @@ void tscFreeRegisteredSqlObj(void *pSql) {
 
   assert(p->self != 0);
   tscFreeSqlObj(p);
-
-  int32_t ref = T_REF_DEC(pTscObj);
-  assert(ref >= 0);
-
-  tscDebug("%p free sqlObj completed, tscObj:%p ref:%d", p, pTscObj, ref);
-  if (ref == 0) {
-    tscDebug("%p all sqlObj freed, free tscObj:%p", p, pTscObj);
-    taosRemoveRef(tscRefId, pTscObj->rid);
-  }
+  taosReleaseRef(tscRefId, pTscObj->rid);
 }
 
 void tscFreeTableMetaHelper(void *pTableMeta) {
@@ -810,6 +802,7 @@ static void extractTableMeta(SSqlCmd* pCmd) {
 }
 
 int32_t tscMergeTableDataBlocks(SSqlObj* pSql) {
+  const int INSERT_HEAD_SIZE = sizeof(SMsgDesc) + sizeof(SSubmitMsg); 
   SSqlCmd* pCmd = &pSql->cmd;
 
   void* pVnodeDataBlockHashList = taosHashInit(128, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BIGINT), true, false);
@@ -824,7 +817,7 @@ int32_t tscMergeTableDataBlocks(SSqlObj* pSql) {
     STableDataBlocks* dataBuf = NULL;
     
     int32_t ret = tscGetDataBlockFromList(pVnodeDataBlockHashList, pOneTableBlock->vgId, TSDB_PAYLOAD_SIZE,
-                                tsInsertHeadSize, 0, pOneTableBlock->tableId, pOneTableBlock->pTableMeta, &dataBuf, pVnodeDataBlockList);
+                                INSERT_HEAD_SIZE, 0, pOneTableBlock->tableId, pOneTableBlock->pTableMeta, &dataBuf, pVnodeDataBlockList);
     if (ret != TSDB_CODE_SUCCESS) {
       tscError("%p failed to prepare the data block buffer for merging table data, code:%d", pSql, ret);
       taosHashCleanup(pVnodeDataBlockHashList);
@@ -1917,9 +1910,7 @@ void tscResetForNextRetrieve(SSqlRes* pRes) {
 }
 
 void registerSqlObj(SSqlObj* pSql) {
-  int32_t ref = T_REF_INC(pSql->pTscObj);
-  tscDebug("%p add to tscObj:%p, ref:%d", pSql, pSql->pTscObj, ref);
-
+  taosAcquireRef(tscRefId, pSql->pTscObj->rid);
   pSql->self = taosAddRef(tscObjRef, pSql);
 }
 
@@ -2626,4 +2617,4 @@ int32_t copyTagData(STagData* dst, const STagData* src) {
   }
 
   return 0;
-}
\ No newline at end of file
+}