diff --git a/source/libs/function/src/builtins.c b/source/libs/function/src/builtins.c
index e53776bc7c66554769f8677095057ff6618d37aa..640c160203bff6050e043ee2ea2488d674757a87 100644
--- a/source/libs/function/src/builtins.c
+++ b/source/libs/function/src/builtins.c
@@ -1379,6 +1379,20 @@ static bool validateTimezoneFormat(const SValueNode* pVal) {
   return true;
 }
 
+void static addDbPrecisonParam(SNodeList* pList, uint8_t precision) {
+  SValueNode* pVal = (SValueNode*)nodesMakeNode(QUERY_NODE_VALUE);
+  pVal->literal = NULL;
+  pVal->isDuration = false;
+  pVal->translate = true;
+  pVal->node.resType.type = TSDB_DATA_TYPE_TINYINT;
+  pVal->node.resType.bytes = tDataTypes[TSDB_DATA_TYPE_TINYINT].bytes;
+  pVal->node.resType.precision = precision;
+  pVal->datum.i = (int64_t)precision;
+  pVal->typeData = (int64_t)precision;
+
+  nodesListAppend(pList, (SNode*)pVal);
+}
+
 void static addTimezoneParam(SNodeList* pList) {
   char       buf[6] = {0};
   time_t     t = taosTime(NULL);
@@ -1462,6 +1476,9 @@ static int32_t translateTimeTruncate(SFunctionNode* pFunc, char* pErrBuf, int32_
     return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
   }
 
+  uint8_t dbPrec = pFunc->node.resType.precision;
+  addDbPrecisonParam(pFunc->pParameterList, dbPrec);
+
   pFunc->node.resType =
       (SDataType){.bytes = tDataTypes[TSDB_DATA_TYPE_TIMESTAMP].bytes, .type = TSDB_DATA_TYPE_TIMESTAMP};
   return TSDB_CODE_SUCCESS;
diff --git a/source/libs/scalar/src/sclfunc.c b/source/libs/scalar/src/sclfunc.c
index 80bebafef2f5bebc6e923b236267ca1ab410b2b3..57962abc01e0e79d1a00fb3a041147530d5c3e4f 100644
--- a/source/libs/scalar/src/sclfunc.c
+++ b/source/libs/scalar/src/sclfunc.c
@@ -1192,10 +1192,10 @@ int32_t toJsonFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOu
 
 int32_t timeTruncateFunction(SScalarParam *pInput, int32_t inputNum, SScalarParam *pOutput) {
   int32_t type = GET_PARAM_TYPE(&pInput[0]);
-  int32_t timePrec = GET_PARAM_PRECISON(&pInput[0]);
 
-  int64_t timeUnit, timeVal = 0;
+  int64_t timeUnit, timePrec, timeVal = 0;
   GET_TYPED_DATA(timeUnit, int64_t, GET_PARAM_TYPE(&pInput[1]), pInput[1].columnData->pData);
+  GET_TYPED_DATA(timePrec, int64_t, GET_PARAM_TYPE(&pInput[2]), pInput[2].columnData->pData);
 
   int64_t factor = (timePrec == TSDB_TIME_PRECISION_MILLI) ? 1000 :
                    (timePrec == TSDB_TIME_PRECISION_MICRO ? 1000000 : 1000000000);