diff --git a/source/common/src/tmsg.c b/source/common/src/tmsg.c
index 811a492b87..c6ec4cabe5 100644
--- a/source/common/src/tmsg.c
+++ b/source/common/src/tmsg.c
@@ -4666,7 +4666,7 @@ int32_t tSerializeSSubQueryMsg(void *buf, int32_t bufLen, SSubQueryMsg *pReq) {
   if (tEncodeU32(&encoder, pReq->sqlLen) < 0) return -1;
   if (tEncodeCStrWithLen(&encoder, pReq->sql, pReq->sqlLen) < 0) return -1;
   if (tEncodeU32(&encoder, pReq->msgLen) < 0) return -1;
-  if (tEncodeCStrWithLen(&encoder, pReq->msg, pReq->msgLen) < 0) return -1;
+  if (tEncodeBinary(&encoder, (uint8_t*)pReq->msg, pReq->msgLen) < 0) return -1;
 
   tEndEncode(&encoder);
 
@@ -4706,7 +4706,7 @@ int32_t tDeserializeSSubQueryMsg(void *buf, int32_t bufLen, SSubQueryMsg *pReq)
   if (tDecodeU32(&decoder, &pReq->sqlLen) < 0) return -1;
   if (tDecodeCStrAlloc(&decoder, &pReq->sql) < 0) return -1;
   if (tDecodeU32(&decoder, &pReq->msgLen) < 0) return -1;
-  if (tDecodeCStrAlloc(&decoder, &pReq->msg) < 0) return -1;
+  if (tDecodeBinaryAlloc(&decoder, (void**)&pReq->msg, NULL) < 0) return -1;
   
   tEndDecode(&decoder);
 
diff --git a/source/libs/qworker/src/qwMsg.c b/source/libs/qworker/src/qwMsg.c
index 71f24f8acd..bb8a7cd140 100644
--- a/source/libs/qworker/src/qwMsg.c
+++ b/source/libs/qworker/src/qwMsg.c
@@ -385,6 +385,8 @@ int32_t qWorkerPreprocessQueryMsg(void *qWorkerMgmt, SRpcMsg *pMsg, bool chkGran
   code = qwPreprocessQuery(QW_FPARAMS(), &qwMsg);
   QW_SCH_TASK_DLOG("prerocessQuery end, handle:%p, code:%x", pMsg->info.handle, code);
 
+  tFreeSSubQueryMsg(&msg);
+
   return TSDB_CODE_SUCCESS;
 }