diff --git a/tests/pytest/functions/function_percentile.py b/tests/pytest/functions/function_percentile.py
index e793008ce681a04111fdee29e91520fed944d05a..688e91eefa79348a88f37f3b7cb0cc1ac63152d8 100644
--- a/tests/pytest/functions/function_percentile.py
+++ b/tests/pytest/functions/function_percentile.py
@@ -144,8 +144,10 @@ class TDTestCase:
         print("apercentile result: %s" % tdSql.getData(0, 0))
 
         # Test case for: https://jira.taosdata.com:18080/browse/TD-2609
+
+        # modified for : https://jira.taosdata.com:18080/browse/TD-2627
         tdSql.execute("create table st(ts timestamp, k int)")
-        tdSql.execute("insert into st values(now, -100)")
+        tdSql.execute("insert into st values(now, -100)(now+1a,-99)")
         tdSql.query("select apercentile(k, 20) from st")
         tdSql.checkData(0, 0, -100.00)