diff --git a/tests/system-test/1-insert/alter_stable.py b/tests/system-test/1-insert/alter_stable.py
index a4cec781384818b777abf1b90a31d6c88f51693a..f11b355bc40ec3367151fe1a11611fdcb86bfb11 100644
--- a/tests/system-test/1-insert/alter_stable.py
+++ b/tests/system-test/1-insert/alter_stable.py
@@ -22,7 +22,7 @@ from util.common import *
 class TDTestCase:
     def init(self, conn, logSql):
         tdLog.debug("start to execute %s" % __file__)
-        tdSql.init(conn.cursor())
+        tdSql.init(conn.cursor(),logSql)
         self.setsql = TDSetSql()
         self.ntbname = 'ntb'
         self.stbname = 'stb'
@@ -108,8 +108,8 @@ class TDTestCase:
                 tdSql.error(f'alter stable {self.stbname}_{i} add column {key} {values}')
                 tdSql.error(f'alter stable {self.stbname}_{i} drop column {key}')
             #! bug TD-16921
-            #tdSql.error(f'alter stable {self.ntbname} add column {key} {values}')
-            #tdSql.error(f'alter stable {self.ntbname} drop column {key}')
+            tdSql.error(f'alter stable {self.ntbname} add column {key} {values}')
+            tdSql.error(f'alter stable {self.ntbname} drop column {key}')
             tdSql.execute(f'alter stable {self.stbname} drop column {key}')
             tdSql.query(f'describe {self.stbname}')
             tdSql.checkRows(len(self.column_dict)+len(self.tag_dict))
@@ -132,7 +132,7 @@ class TDTestCase:
                     tdSql.checkEqual(result[0][2],self.binary_length+1)
                     tdSql.error(f'alter stable {self.stbname}_{i} modify column {key} {v}')
                #! bug TD-16921
-               # tdSql.error(f'alter stable {self.ntbname} modify column {key} {v}')
+                tdSql.error(f'alter stable {self.ntbname} modify column {key} {v}')
             elif 'nchar' in values.lower():
                 v = f'nchar({self.binary_length+1})'
                 v_error = f'nchar({self.binary_length-1})'
@@ -147,11 +147,11 @@ class TDTestCase:
                     tdSql.checkEqual(result[0][2],self.binary_length+1)
                     tdSql.error(f'alter stable {self.stbname}_{i} modify column {key} {v}')
                 #! bug TD-16921
-                #tdSql.error(f'alter stable {self.ntbname} modify column {key} {v}')
+                tdSql.error(f'alter stable {self.ntbname} modify column {key} {v}')
             else:
                 for v in self.column_dict.values():
                     tdSql.error(f'alter stable {self.stbname} modify column {key} {v}')
-                   # tdSql.error(f'alter stable {self.ntbname} modify column {key} {v}')
+                    tdSql.error(f'alter stable {self.ntbname} modify column {key} {v}')
                     for i in range(self.tbnum):
                         tdSql.error(f'alter stable {self.stbname}_{i} modify column {key} {v}')
     def run(self):