diff --git a/include/util/taoserror.h b/include/util/taoserror.h
index b8baf99552..abc752955d 100644
--- a/include/util/taoserror.h
+++ b/include/util/taoserror.h
@@ -264,7 +264,8 @@ int32_t* taosGetErrno();
 #define TSDB_CODE_MND_TRANS_ALREADY_EXIST       TAOS_DEF_ERROR_CODE(0, 0x03D0)
 #define TSDB_CODE_MND_TRANS_NOT_EXIST           TAOS_DEF_ERROR_CODE(0, 0x03D1)
 #define TSDB_CODE_MND_TRANS_INVALID_STAGE       TAOS_DEF_ERROR_CODE(0, 0x03D2)
-#define TSDB_CODE_MND_TRANS_CAN_NOT_PARALLEL    TAOS_DEF_ERROR_CODE(0, 0x03D4)
+#define TSDB_CODE_MND_TRANS_CONFLICT            TAOS_DEF_ERROR_CODE(0, 0x03D3)
+#define TSDB_CODE_MND_TRANS_UNKNOW_ERROR        TAOS_DEF_ERROR_CODE(0, 0x03D4)
 
 // mnode-mq
 #define TSDB_CODE_MND_TOPIC_ALREADY_EXIST       TAOS_DEF_ERROR_CODE(0, 0x03E0)
diff --git a/source/dnode/mnode/impl/src/mndTrans.c b/source/dnode/mnode/impl/src/mndTrans.c
index ce2a0efd2f..1c238d4082 100644
--- a/source/dnode/mnode/impl/src/mndTrans.c
+++ b/source/dnode/mnode/impl/src/mndTrans.c
@@ -710,12 +710,12 @@ static bool mndIsStbTrans(STrans *pTrans) {
   return pTrans->type > TRN_TYPE_STB_SCOPE && pTrans->type < TRN_TYPE_STB_SCOPE_END;
 }
 
-static bool mndCheckTransCanParallel(SMnode *pMnode, STrans *pNewTrans) {
+static bool mndCheckTransConflict(SMnode *pMnode, STrans *pNewTrans) {
   STrans *pTrans = NULL;
   void   *pIter = NULL;
-  bool    canParallel = true;
+  bool    conflict = false;
 
-  if (mndIsBasicTrans(pNewTrans)) return canParallel;
+  if (mndIsBasicTrans(pNewTrans)) return conflict;
 
   while (1) {
     pIter = sdbFetch(pMnode->pSdb, SDB_TRANS, pIter, (void **)&pTrans);
@@ -724,7 +724,7 @@ static bool mndCheckTransCanParallel(SMnode *pMnode, STrans *pNewTrans) {
     if (mndIsGlobalTrans(pNewTrans)) {
       if (mndIsDbTrans(pTrans) || mndIsStbTrans(pTrans)) {
         mError("trans:%d, can't execute since trans:%d in progress db:%s", pNewTrans->id, pTrans->id, pTrans->dbname);
-        canParallel = false;
+        conflict = true;
       } else {
       }
     }
@@ -732,11 +732,11 @@ static bool mndCheckTransCanParallel(SMnode *pMnode, STrans *pNewTrans) {
     else if (mndIsDbTrans(pNewTrans)) {
       if (mndIsGlobalTrans(pTrans)) {
         mError("trans:%d, can't execute since trans:%d in progress", pNewTrans->id, pTrans->id);
-        canParallel = false;
+        conflict = true;
       } else if (mndIsDbTrans(pTrans) || mndIsStbTrans(pTrans)) {
         if (pNewTrans->dbUid == pTrans->dbUid) {
           mError("trans:%d, can't execute since trans:%d in progress db:%s", pNewTrans->id, pTrans->id, pTrans->dbname);
-          canParallel = false;
+          conflict = true;
         }
       } else {
       }
@@ -745,11 +745,11 @@ static bool mndCheckTransCanParallel(SMnode *pMnode, STrans *pNewTrans) {
     else if (mndIsStbTrans(pNewTrans)) {
       if (mndIsGlobalTrans(pTrans)) {
         mError("trans:%d, can't execute since trans:%d in progress", pNewTrans->id, pTrans->id);
-        canParallel = false;
+        conflict = true;
       } else if (mndIsDbTrans(pTrans)) {
         if (pNewTrans->dbUid == pTrans->dbUid) {
           mError("trans:%d, can't execute since trans:%d in progress db:%s", pNewTrans->id, pTrans->id, pTrans->dbname);
-          canParallel = false;
+          conflict = true;
         }
       } else {
       }
@@ -760,12 +760,12 @@ static bool mndCheckTransCanParallel(SMnode *pMnode, STrans *pNewTrans) {
 
   sdbCancelFetch(pMnode->pSdb, pIter);
   sdbRelease(pMnode->pSdb, pTrans);
-  return canParallel;
+  return conflict;
 }
 
 int32_t mndTransPrepare(SMnode *pMnode, STrans *pTrans) {
-  if (!mndCheckTransCanParallel(pMnode, pTrans)) {
-    terrno = TSDB_CODE_MND_TRANS_CAN_NOT_PARALLEL;
+  if (mndCheckTransConflict(pMnode, pTrans)) {
+    terrno = TSDB_CODE_MND_TRANS_CONFLICT;
     mError("trans:%d, failed to prepare since %s", pTrans->id, terrstr());
     return -1;
   }
@@ -819,7 +819,8 @@ static int32_t mndTransRollback(SMnode *pMnode, STrans *pTrans) {
 }
 
 static void mndTransSendRpcRsp(SMnode *pMnode, STrans *pTrans) {
-  bool sendRsp = false;
+  bool    sendRsp = false;
+  int32_t code = pTrans->code;
 
   if (pTrans->stage == TRN_STAGE_FINISHED) {
     sendRsp = true;
@@ -829,12 +830,14 @@ static void mndTransSendRpcRsp(SMnode *pMnode, STrans *pTrans) {
     if (pTrans->stage == TRN_STAGE_UNDO_LOG || pTrans->stage == TRN_STAGE_UNDO_ACTION ||
         pTrans->stage == TRN_STAGE_ROLLBACK) {
       sendRsp = true;
+      if (code == 0) code = TSDB_CODE_MND_TRANS_UNKNOW_ERROR;
     }
   }
 
   if (pTrans->policy == TRN_POLICY_RETRY) {
     if (pTrans->stage == TRN_STAGE_REDO_ACTION && pTrans->failedTimes > 0) {
       sendRsp = true;
+      if (code == 0) code = TSDB_CODE_MND_TRANS_UNKNOW_ERROR;
     }
   }
 
@@ -845,13 +848,13 @@ static void mndTransSendRpcRsp(SMnode *pMnode, STrans *pTrans) {
     }
     taosMemoryFree(pTrans->rpcRsp);
 
-    mDebug("trans:%d, send rsp, code:0x%04x stage:%d app:%p", pTrans->id, pTrans->code & 0xFFFF, pTrans->stage,
+    mDebug("trans:%d, send rsp, code:0x%04x stage:%d app:%p", pTrans->id, code & 0xFFFF, pTrans->stage,
            pTrans->rpcAHandle);
     SRpcMsg rspMsg = {
         .handle = pTrans->rpcHandle,
         .ahandle = pTrans->rpcAHandle,
         .refId = pTrans->rpcRefId,
-        .code = pTrans->code,
+        .code = code,
         .pCont = rpcCont,
         .contLen = pTrans->rpcRspLen,
     };
diff --git a/source/util/src/terror.c b/source/util/src/terror.c
index bd787d50b0..00fe8bd0e9 100644
--- a/source/util/src/terror.c
+++ b/source/util/src/terror.c
@@ -271,7 +271,8 @@ TAOS_DEFINE_ERROR(TSDB_CODE_MND_INVALID_FUNC_RETRIEVE,    "Invalid func retrieve
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_TRANS_ALREADY_EXIST,      "Transaction already exists")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_TRANS_NOT_EXIST,          "Transaction not exists")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_TRANS_INVALID_STAGE,      "Invalid stage to kill")
-TAOS_DEFINE_ERROR(TSDB_CODE_MND_TRANS_CAN_NOT_PARALLEL,   "Conflicting transaction not completed")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_TRANS_CONFLICT,           "Conflict transaction not completed")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_TRANS_UNKNOW_ERROR,       "Unknown transaction error")
 
 // mnode-mq
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_TOPIC_ALREADY_EXIST,      "Topic already exists")