diff --git a/tests/pytest/query/nestedQuery/queryInterval.py b/tests/pytest/query/nestedQuery/queryInterval.py
index fc94cdf4eb3bb6c83cf9795779655b2b8a03444f..a7c06a18f9581375312ceac1509783fc81f566fe 100644
--- a/tests/pytest/query/nestedQuery/queryInterval.py
+++ b/tests/pytest/query/nestedQuery/queryInterval.py
@@ -32,25 +32,64 @@ class TDTestCase:
         # tdSql.execute("drop database db ")
         tdSql.prepare()
         tdSql.execute("create table st (ts timestamp, num int,  value int , t_instance int) tags (loc nchar(30))")
-        number = 20
-        for n in range(number):
-            dt= n*300000   # collecting'frequency is 10s 
-            args1=(self.ts1+dt,n,100+n,10+n)
-            args2=(self.ts2+dt,n,120+n,15+n)
-            tdSql.execute("insert into t0 using st tags('beijing')  values(%d, %d, %d, %d)" % args1)
-            tdSql.execute("insert into t1 using st tags('shanghai') values(%d, %d, %d, %d)" % args2)             
+        node = 5
+        number = 10
+        for n in range(node):
+            for m in range(number):
+                dt= m*300000+n*60000  # collecting'frequency is 10s 
+                args1=(n,n,self.ts1+dt,n,100+2*m+2*n,10+m+n)
+                # args2=(n,self.ts2+dt,n,120+n,15+n)
+                tdSql.execute("insert into t%d using st tags('beijing%d')  values(%d, %d, %d, %d)" % args1)
+                # tdSql.execute("insert into t1 using st tags('shanghai') values(%d, %d, %d, %d)" % args2)             
                 
-
+        # interval function
         tdSql.query("select avg(value) from st interval(10m)")
         print(tdSql.queryResult)
-        tdSql.checkRows(11)        
+        tdSql.checkRows(6)        
         tdSql.checkData(0, 0, "2020-07-01 04:20:00")
-        tdSql.query("select avg_val from(select avg(value) as avg_val from st where loc='beijing' interval(10m));")
-        # tdSql.query("select avg(avg_val) from(select avg(value) as avg_val from st where loc='beijing' interval(10m));")
-        print(tdSql.queryResult)
-        tdSql.checkData(0, 0, 109.5)        
-        
+        tdSql.checkData(1, 1, 107.4)
+       
+        # subquery with interval
+        tdSql.query("select avg(avg_val) from(select avg(value) as avg_val from st where loc='beijing0' interval(10m));")
+        tdSql.checkData(0, 0, 109.0)
+
+        # subquery with interval and select two Column in parent query
+        # tdSql.query("select ts,avg(avg_val) from(select avg(value) as avg_val from st where loc='beijing0' interval(10m));")
+
+        # subquery with interval and sliding 
+        tdSql.query("select avg(value) as avg_val from st where loc='beijing0' interval(8m) sliding(30s) limit 1;")   
+        tdSql.checkData(0, 0, "2020-07-01 04:17:00")
+        tdSql.checkData(0, 1, 107.4) 
+        tdSql.query("select avg(avg_val) from(select avg(value) as avg_val from st where loc='beijing1' interval(8m) sliding(30s));")
+        tdSql.checkData(0, 0, 111)
         
+        # subquery with interval and offset
+        tdSql.query("select avg(value) as avg_val from st where loc='beijing0' interval(5m,1m);")
+        tdSql.checkData(0, 0, "2020-07-01 04:21:00")
+        tdSql.query("select avg(avg_val) from(select avg(value) as avg_val from st where loc='beijing0' interval(5m,1m));")
+        tdSql.checkData(0, 0, 111)
+
+        # subquery  with interval,sliding and group by ; parent query with interval
+        tdSql.query("select avg(value) as avg_val from st where loc='beijing0' interval(8m) sliding(1m) group by loc limit 1 offset 52 ;")
+        tdSql.checkData(0, 0, "2020-07-01 05:09:00")
+        tdSql.checkData(0, 1, 118)
+        tdSql.query("select avg(avg_val) from(select avg(value) as avg_val from st where loc!='beijing0' interval(8m) sliding(1m)  group by loc )interval(5m);")
+        tdSql.checkData(0, 0, 111)
+
+        # #  subquery and parent query with interval and sliding 
+        # tdSql.query("select avg(avg_val) from(select avg(value) as avg_val from st where loc='beijing1' interval(8m) sliding(30s)) interval(5m) sliding(1s);")
+        # tdSql.checkData(0, 0, 111)
+
+        # subquery and parent query with top and bottom
+        tdSql.query("select top(avg_val,2) from(select avg(value) as avg_val,num from st where loc!='beijing0' group by num);")
+        tdSql.checkData(0, 0, 111)
+        tdSql.query("select bottom(avg_val,2) from(select avg(value) as avg_val,num from st where loc!='beijing0' group by num);")
+        tdSql.checkData(0, 0, 111)
+
+
+
+
+
         # tdSql.query("select avg(voltage) from st interval(1n, 15d)")
 
         # tdSql.query("select avg(voltage) from st interval(1n, 15d) group by loc")