diff --git a/tests/system-test/2-query/abs.py b/tests/system-test/2-query/abs.py
index f0f559c6aa9f271ebefbaf564084c12326d54fe4..f924cb7c3d82667367678623943544a6d72cbd08 100644
--- a/tests/system-test/2-query/abs.py
+++ b/tests/system-test/2-query/abs.py
@@ -555,8 +555,8 @@ class TDTestCase:
         tdSql.checkRows(1)
         tdSql.checkData(0,0,0)
         
-        tdSql.query("select last_row(c1) from (select ts , c1 ,t1 from stb1)")
-        tdSql.checkRows(20)
+        tdSql.query("select abs(c1) from (select ts , c1 ,t1 from stb1)")
+        tdSql.checkRows(25)
 
         tdSql.query(
             "select abs(c1+t1)*t1 from stb1 where abs(c1)/floor(abs(ceil(t1))) ==1")