diff --git a/tests/system-test/2-query/columnLenUpdated.py b/tests/system-test/2-query/columnLenUpdated.py
index d6940fde8b..ea01cd623c 100644
--- a/tests/system-test/2-query/columnLenUpdated.py
+++ b/tests/system-test/2-query/columnLenUpdated.py
@@ -147,9 +147,9 @@ class TDTestCase:
         tdSql.checkData(1, 1, '55555')
 
 
-        tdSql.query("create table stb (ts timestamp, f1 int) tags (tg1 binary(2))")
+        tdSql.query("create table stb (ts timestamp, f1 int, f2 binary(2)) tags (tg1 binary(2))")
         tdSql.query("create table tb1 using stb tags('bb')")
-        tdSql.query("insert into tb1 values (now, 2)")
+        tdSql.query("insert into tb1 values (now, 2,'22')")
         tdSql.query("select count(*) from stb group by tg1")
         tdSql.checkData(0, 0, 1)
 
@@ -163,13 +163,23 @@ class TDTestCase:
         if retCode != "TAOS_OK":
             tdLog.exit("taos -s fail")
 
-        keyDict['s'] = "\"insert into db1.tb2 values (now, 2)\""
+        keyDict['s'] = "\"insert into db1.tb2 values (now, 2,'22')\""
+        retCode = taos_command(buildPath, "s", keyDict['s'], "Insert OK", '')
+        if retCode != "TAOS_OK":
+            tdLog.exit("taos -s fail")
+
+        keyDict['s'] = "\"alter table db1.stb modify column f2 binary(5) \""
+        retCode = taos_command(buildPath, "s", keyDict['s'], "Query OK", '')
+        if retCode != "TAOS_OK":
+            tdLog.exit("taos -s fail")
+
+        keyDict['s'] = "\"insert into db1.tb2 values (now, 3,'55555')\""
         retCode = taos_command(buildPath, "s", keyDict['s'], "Insert OK", '')
         if retCode != "TAOS_OK":
             tdLog.exit("taos -s fail")
 
         tdSql.query("select count(*) from stb group by tg1")
-        tdSql.checkData(0, 0, 1)
+        tdSql.checkData(0, 0, 2)
         tdSql.checkData(1, 0, 1)