diff --git a/tests/system-test/0-others/tag_index_basic.py b/tests/system-test/0-others/tag_index_basic.py
index 2d2f7a231b4be34f1ce5fc974d53ca56d1b46a27..015ecc5c115aee18f16553844a854dd1428fbd79 100644
--- a/tests/system-test/0-others/tag_index_basic.py
+++ b/tests/system-test/0-others/tag_index_basic.py
@@ -81,7 +81,8 @@ class TDTestCase:
 
         # create child table
         for i in range(count):
-            tags = f'{i},{i},{i},{i},{i},{i},{i},{i},{i}.000{i},{i}.000{i},true,"var{i}","nch{i}",now'
+            ti = i % 128
+            tags = f'{ti},{ti},{i},{i},{ti},{ti},{i},{i},{i}.000{i},{i}.000{i},true,"var{i}","nch{i}",now'
             sql  = f'create table {tbname}{i} using {stbname} tags({tags})'
             tdSql.execute(sql)