diff --git a/tests/script/general/explain/explain.sim b/tests/script/general/explain/explain.sim
new file mode 100644
index 0000000000000000000000000000000000000000..666e4040b7e17ac983037c764f54637ba43cb292
--- /dev/null
+++ b/tests/script/general/explain/explain.sim
@@ -0,0 +1,102 @@
+system sh/stop_dnodes.sh
+
+system sh/deploy.sh -n dnode1 -i 1
+system sh/cfg.sh -n dnode1 -c wallevel -v 2
+system sh/cfg.sh -n dnode1 -c numOfMnodes -v 1
+
+print ========= start dnode1 as master
+system sh/exec.sh -n dnode1 -s start
+sleep 2000
+sql connect
+
+print ======== step1 
+sql create database db1 vgroups 3;
+sql use db1;
+sql show databases;
+sql create stable st1 (ts timestamp, f1 int, f2 binary(200)) tags(t1 int);
+sql create stable st2 (ts timestamp, f1 int, f2 binary(200)) tags(t1 int);
+sql create table tb1 using st1 tags(1);
+sql insert into tb1 values (now, 1, "Hash Join  (cost=230.47..713.98 rows=101 width=488) (actual time=0.711..7.427 rows=100 loops=1)");
+
+sql create table tb2 using st1 tags(2);
+sql insert into tb2 values (now, 2, "Seq Scan on tenk2 t2  (cost=0.00..445.00 rows=10000 width=244) (actual time=0.007..2.583 rows=10000 loops=1)");
+sql create table tb3 using st1 tags(3);
+sql insert into tb3 values (now, 3, "Hash  (cost=229.20..229.20 rows=101 width=244) (actual time=0.659..0.659 rows=100 loops=1)");
+sql create table tb4 using st1 tags(4);
+sql insert into tb4 values (now, 4, "Bitmap Heap Scan on tenk1 t1  (cost=5.07..229.20 rows=101 width=244) (actual time=0.080..0.526 rows=100 loops=1)");
+
+sql create table tb1 using st2 tags(1);
+sql insert into tb1 values (now, 1, "Hash Join  (cost=230.47..713.98 rows=101 width=488) (actual time=0.711..7.427 rows=100 loops=1)");
+
+sql create table tb2 using st2 tags(2);
+sql insert into tb2 values (now, 2, "Seq Scan on tenk2 t2  (cost=0.00..445.00 rows=10000 width=244) (actual time=0.007..2.583 rows=10000 loops=1)");
+sql create table tb3 using st2 tags(3);
+sql insert into tb3 values (now, 3, "Hash  (cost=229.20..229.20 rows=101 width=244) (actual time=0.659..0.659 rows=100 loops=1)");
+sql create table tb4 using st2 tags(4);
+sql insert into tb4 values (now, 4, "Bitmap Heap Scan on tenk1 t1  (cost=5.07..229.20 rows=101 width=244) (actual time=0.080..0.526 rows=100 loops=1)");
+
+
+print ======== step2 
+sql explain select * from st1 where -2;
+sql explain select ts from tb1;
+sql explain select * from st1;
+sql explain select * from st1 order by ts;
+sql explain select * from information_schema.user_stables;
+sql explain select count(*),sum(f1) from tb1;
+sql explain select count(*),sum(f1) from st1;
+sql explain select count(*),sum(f1) from st1 group by f1;
+sql explain select count(f1) from tb1 interval(1s, 2d) sliding(3s) fill(prev);
+sql explain select min(f1) from st1 interval(1m, 2a) sliding(3n); 
+
+print ======== step3 
+sql explain verbose true select * from st1 where -2;
+sql explain verbose true select ts from tb1 where f1 > 0;
+sql explain verbose true select * from st1 where f1 > 0 and ts > '2020-10-31 00:00:00' and ts < '2021-10-31 00:00:00';
+sql explain verbose true select * from information_schema.user_stables where db_name='db2';
+sql explain verbose true select count(*),sum(f1) from st1 where f1 > 0 and ts > '2021-10-31 00:00:00' group by f1 having sum(f1) > 0;
+
+print ======== step4 
+sql explain analyze select ts from st1 where -2;
+sql explain analyze select ts from tb1;
+sql explain analyze select ts from st1;
+sql explain analyze select ts from st1;
+sql explain analyze select ts from st1 order by ts;
+sql explain analyze select * from information_schema.user_stables;
+sql explain analyze select count(*),sum(f1) from tb1;
+sql explain analyze select count(*),sum(f1) from st1;
+sql explain analyze select count(*),sum(f1) from st1 group by f1;
+sql explain analyze select count(f1) from tb1 interval(1s, 2d) sliding(3s) fill(prev);
+sql explain analyze select min(f1) from st1 interval(3n, 2a) sliding(1n); 
+
+print ======== step5 
+sql explain analyze verbose true select ts from st1 where -2;
+sql explain analyze verbose true select ts from tb1;
+sql explain analyze verbose true select ts from st1;
+sql explain analyze verbose true select ts from st1;
+sql explain analyze verbose true select ts from st1 order by ts;
+sql explain analyze verbose true select * from information_schema.user_stables;
+sql explain analyze verbose true select count(*),sum(f1) from tb1;
+sql explain analyze verbose true select count(*),sum(f1) from st1;
+sql explain analyze verbose true select count(*),sum(f1) from st1 group by f1;
+sql explain analyze verbose true select count(f1) from tb1 interval(1s, 2d) sliding(3s) fill(prev);
+sql explain analyze verbose true select ts from tb1 where f1 > 0;
+sql explain analyze verbose true select f1 from st1 where f1 > 0 and ts > '2020-10-31 00:00:00' and ts < '2021-10-31 00:00:00';
+sql explain analyze verbose true select * from information_schema.user_stables where db_name='db2';
+sql explain analyze verbose true select count(*),sum(f1) from st1 where f1 > 0 and ts > '2021-10-31 00:00:00' group by f1 having sum(f1) > 0;
+sql explain analyze verbose true select min(f1) from st1 interval(3n, 2a) sliding(1n); 
+sql explain analyze verbose true select * from (select min(f1),count(*) a from st1 where f1 > 0) where a < 0;
+
+#not pass case
+#sql explain verbose true select count(*),sum(f1) as aa from tb1 where (f1 > 0 or f1 < -1) and ts > '2020-10-31 00:00:00' and ts < '2021-10-31 00:00:00' order by aa;
+#sql explain verbose true select * from st1 where (f1 > 0 or f1 < -1) and ts > '2020-10-31 00:00:00' and ts < '2021-10-31 00:00:00' order by ts;
+#sql explain verbose true select count(*),sum(f1) from st1 where (f1 > 0 or f1 < -1) and ts > '2020-10-31 00:00:00' and ts < '2021-10-31 00:00:00' order by ts;
+#sql explain verbose true select count(f1) from tb1 where (f1 > 0 or f1 < -1) and ts > '2020-10-31 00:00:00' and ts < '2021-10-31 00:00:00' interval(1s, 2d) sliding(3s) order by ts;
+#sql explain verbose true select min(f1) from st1 where (f1 > 0 or f1 < -1) and ts > '2020-10-31 00:00:00' and ts < '2021-10-31 00:00:00' interval(1m, 2a) sliding(3n)  fill(linear) order by ts;
+#sql explain select max(f1) from tb1 SESSION(ts, 1s);
+#sql explain select max(f1) from st1 SESSION(ts, 1s);
+#sql explain select * from tb1, tb2 where tb1.ts=tb2.ts;
+#sql explain select * from st1, st2 where tb1.ts=tb2.ts;
+#sql explain analyze verbose true select sum(a+b) from (select _rowts, min(f1) b,count(*) a from st1 where f1 > 0 interval(1a)) where a < 0 interval(1s);
+
+
+system sh/exec.sh -n dnode1 -s stop -x SIGINT
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