diff --git a/src/kit/taosdemo/taosdemo.c b/src/kit/taosdemo/taosdemo.c
index eb0a2d38229946227b9f238295d6686d18d2a47a..37023913c485f7d02274ed56c2ba103d9562c84c 100644
--- a/src/kit/taosdemo/taosdemo.c
+++ b/src/kit/taosdemo/taosdemo.c
@@ -725,7 +725,7 @@ static void parse_args(int argc, char *argv[], SArguments *arguments) {
         errorPrint("%s", "\n\t-c need a valid path following!\n");
         exit(EXIT_FAILURE);
       }
-      tstrncpy(configDir, argv[++i], MAX_FILE_NAME_LEN);
+      tstrncpy(configDir, argv[++i], TSDB_FILENAME_LEN);
 
     } else if (strcmp(argv[i], "-h") == 0) {
       if (argc == i+1) {
@@ -967,9 +967,9 @@ static void parse_args(int argc, char *argv[], SArguments *arguments) {
       }
     } else if (strcmp(argv[i], "-D") == 0) {
       arguments->method_of_delete = atoi(argv[++i]);
-      if (arguments->method_of_delete < 0
-              || arguments->method_of_delete > 3) {
-        arguments->method_of_delete = 0;
+      if (arguments->method_of_delete > 3) {
+        errorPrint("%s", "\n\t-D need a valud (0~3) number following!\n");
+        exit(EXIT_FAILURE);
       }
     } else if ((strcmp(argv[i], "--version") == 0) ||
         (strcmp(argv[i], "-V") == 0)){
@@ -1372,7 +1372,7 @@ static int printfInsertMeta() {
         printf("      childTblLimit:     \033[33m%"PRId64"\033[0m\n",
                 g_Dbs.db[i].superTbls[j].childTblLimit);
       }
-      if (g_Dbs.db[i].superTbls[j].childTblOffset >= 0) {
+      if (g_Dbs.db[i].superTbls[j].childTblOffset > 0) {
         printf("      childTblOffset:    \033[33m%"PRIu64"\033[0m\n",
                 g_Dbs.db[i].superTbls[j].childTblOffset);
       }
@@ -4706,8 +4706,7 @@ static void getTableName(char *pTblName, threadInfo* pThreadInfo, uint64_t table
 {
   SSuperTable* superTblInfo = pThreadInfo->superTblInfo;
   if (superTblInfo) {
-    if ((superTblInfo->childTblOffset >= 0)
-            && (superTblInfo->childTblLimit > 0)) {
+    if (superTblInfo->childTblLimit > 0) {
         snprintf(pTblName, TSDB_TABLE_NAME_LEN, "%s",
             superTblInfo->childTblName +
             (tableSeq - superTblInfo->childTblOffset) * TSDB_TABLE_NAME_LEN);
@@ -5611,8 +5610,7 @@ static void startMultiThreadInsertData(int threads, char* db_name,
       printf("WARNING: offset and limit will not be used since the child tables not exists!\n");
     }
 
-    if ((superTblInfo->childTblExists == TBL_ALREADY_EXISTS)
-            && (superTblInfo->childTblOffset >= 0)) {
+    if (superTblInfo->childTblExists == TBL_ALREADY_EXISTS) {
       if ((superTblInfo->childTblLimit < 0)
           || ((superTblInfo->childTblOffset + superTblInfo->childTblLimit)
             > (superTblInfo->childTblCount))) {
diff --git a/src/kit/taosdump/taosdump.c b/src/kit/taosdump/taosdump.c
index 0dca591b04cde03da3bc264815538fd6e8db2714..f7cb3e93d1c5f45113b2f05b5f99b31a7feffc63 100644
--- a/src/kit/taosdump/taosdump.c
+++ b/src/kit/taosdump/taosdump.c
@@ -525,7 +525,7 @@ int main(int argc, char *argv[]) {
 
   /* Parse our arguments; every option seen by parse_opt will be
      reflected in arguments. */
-  if (argc > 1)
+  if (argc > 2)
     parse_args(argc, argv, &g_args);
 
   argp_parse(&argp, argc, argv, 0, 0, &g_args);