diff --git a/tests/system-test/1-insert/alter_table.py b/tests/system-test/1-insert/alter_table.py
index ec3e771cbd9df8dcb1ccb0a47f842f9c1c2d509d..3c17d9525ed162231b631cc00396af6a8f7daf0c 100644
--- a/tests/system-test/1-insert/alter_table.py
+++ b/tests/system-test/1-insert/alter_table.py
@@ -90,13 +90,13 @@ class TDTestCase:
         tdSql.checkData(0,15,tag_nchar)
 
         # bug TD-16211 insert length more than setting binary and nchar
-        # tag_binary = self.get_long_name(length=21, mode="letters")
-        # tag_nchar = self.get_long_name(length=21, mode="letters")
-        # tdSql.error(f'alter table {dbname}.{tbname} set tag t12 = "{tag_binary}"')
-        # tdSql.error(f'alter table {dbname}.{tbname} set tag t13 = "{tag_nchar}"')
+        tag_binary = self.get_long_name(length=21, mode="letters")
+        tag_nchar = self.get_long_name(length=21, mode="letters")
+        tdSql.error(f'alter table {dbname}.{tbname} set tag t12 = "{tag_binary}"')
+        tdSql.error(f'alter table {dbname}.{tbname} set tag t13 = "{tag_nchar}"')
 
         # bug TD-16210 modify binary to nchar
-        # tdSql.error(f'alter table {dbname}.{tbname} modify tag t12 nchar(10)')
+        tdSql.error(f'alter table {dbname}.{tbname} modify tag t12 nchar(10)')
         tdSql.execute(f"drop database {dbname}")
     def alter_ntb_column_check(self):
         '''
diff --git a/tests/system-test/2-query/bottom.py b/tests/system-test/2-query/bottom.py
index 5620975ef2a90ffe47c1d06cdc24f48a1266d288..3c82dd4128c2376065b2479bd282c2713558d993 100644
--- a/tests/system-test/2-query/bottom.py
+++ b/tests/system-test/2-query/bottom.py
@@ -46,10 +46,10 @@ class TDTestCase:
                 tdSql.error(f'select bottom({i},{j}) from stb_1')
         for i in error_column_list:
             tdSql.error(f'select bottom({i},10) from stb_1')
-        # tdSql.query("select ts,bottom(col1, 2),ts from stb_1 group by tbname")
-        # tdSql.checkRows(2)
-        # tdSql.query('select bottom(col2,1) from stb_1 interval(1y) order by col2')
-        # tdSql.checkData(0,0,1)
+        tdSql.query("select ts,bottom(col1, 2),ts from stb_1 group by tbname")
+        tdSql.checkRows(2)
+        tdSql.query('select bottom(col2,1) from stb_1 interval(1y) order by col2')
+        tdSql.checkData(0,0,1)
 
 
         tdSql.error('select * from stb_1 where bottom(col2,1)=1')