diff --git a/tests/system-test/2-query/json_tag_large_tables.py b/tests/system-test/2-query/json_tag_large_tables.py
index fc41858580..5d7df6ceb8 100644
--- a/tests/system-test/2-query/json_tag_large_tables.py
+++ b/tests/system-test/2-query/json_tag_large_tables.py
@@ -43,13 +43,48 @@ class TDTestCase:
         tdSql.execute('create database db vgroups 1')
         tdSql.execute('use db')
         print("============== STEP 1 ===== prepare data & validate json string")
+
+        i = 0
+        # add 100000 table
+        tdSql.execute("create table if not exists jsons1(ts timestamp, dataInt int, dataBool bool, dataStr nchar(50), dataStrBin binary(150)) tags(jtag json)")
+        while i <= 10 0000:
+            sql = """insert into jsons1_{%d} using jsons1 tags('{"tag1":{%d}}') values(1591060618000, 1, false, 'json1', '你是') (1591060608000, 23, true, '等等', 'json')"""%(i, i)
+            tdSql.execute(sql)
+            i = i + 1
+
+        // do query
+        i = 0        
+        while i <= 10 0000:
+            sql = """select count(*) from jsons1 where jtag->'tag1' = %d"""%(i)
+            tdSql.query(sql)
+            if 1 != tdSql.getRows():
+                print("err: %s"%(sql))
+        
+        while i <= 10000000
+            sql = """insert into jsons1_{%d} using jsons1 tags('{"tag1":{%d}}') values(1591060618000, 1, false, 'json1', '你是') (1591060608000, 23, true, '等等', 'json')"""%(i, i)
+            tdSql.execute(sql)
+            i = i + 1
+        
+        i = 0
+        # drop super table
+        tdSql.execute("create table if not exists jsons1(ts timestamp, dataInt int, dataBool bool, dataStr nchar(50), dataStrBin binary(150)) tags(jtag json)")
+        while i <= 100000:
+            sql = """insert into jsons1_{%d} using jsons1 tags('{"tag1":{%d}}') values(1591060618000, 1, false, 'json1', '你是') (1591060608000, 23, true, '等等', 'json')"""%(i, i)
+            tdSql.execute(sql)
+            i = i + 1
+
+        tdSql.execute('drop stable jsons1')
+
+
+        # drop database 
         i = 0
         tdSql.execute("create table if not exists jsons1(ts timestamp, dataInt int, dataBool bool, dataStr nchar(50), dataStrBin binary(150)) tags(jtag json)")
         while i <= 100000:
-            f = "insert into jsons1_{} using jsons1 tags('{\"tag1\":\"fff\",\"tag2\":{}, \"tag3\":true}') values(1591060618000, 1, false, 'json1', '你是') (1591060608000, 23, true, '等等', 'json')".format
-            sql = f(i, i) 
+            sql = """insert into jsons1_{%d} using jsons1 tags('{"tag1":{%d}}') values(1591060618000, 1, false, 'json1', '你是') (1591060608000, 23, true, '等等', 'json')"""%(i, i)
             tdSql.execute(sql)
             i = i + 1
+        tdSql.execute('drop database db')
+        
 
         # test duplicate key using the first one. elimate empty key
         #tdSql.execute("CREATE TABLE if not exists jsons1_8 using jsons1 tags('{\"tag1\":null, \"tag1\":true, \"tag1\":45, \"1tag$\":2, \" \":90, \"\":32}')") tdSql.query("select jtag from jsons1_8") tdSql.checkRows(0);