diff --git a/tests/script/tsim/tagindex/add_index.sim b/tests/script/tsim/tagindex/add_index.sim
index a6e9cae670..70771fc63b 100644
--- a/tests/script/tsim/tagindex/add_index.sim
+++ b/tests/script/tsim/tagindex/add_index.sim
@@ -18,6 +18,20 @@ sql use $dbPrefix
 print =============== create super table and register tag index 
 sql create table if not exists $mtPrefix (ts timestamp, c1 int) tags (t1 int, t2 int, t3 int, t4 int, t5 int)
 
+sql use information_schema; 
+
+sql create index t2i on ta_3_db.ta_3_mt(t2)
+
+sql_error create index t3i on ta_3_mt(t3)  
+
+sql_error drop index t2i 
+sql drop index ta_3_db.t2i
+
+
+sql use $dbPrefix 
+
+
+
 sql show stables
 if $rows != 1 then
   return -1
@@ -310,4 +324,5 @@ sql_error create index ti2 on $mtPrefix (t1)
 sql_error create index t2i on ta_3_tb17 (t2)
 
 
-system sh/exec.sh -n dnode1 -s stop -x SIGINT
\ No newline at end of file
+
+system sh/exec.sh -n dnode1 -s stop -x SIGINT