diff --git a/tests/system-test/2-query/irate.py b/tests/system-test/2-query/irate.py
index 9738879145b13a9796dbe25423e50f2cdd2e8ca5..47998abbe745907eadad27e99a29b34f61a6b9fb 100644
--- a/tests/system-test/2-query/irate.py
+++ b/tests/system-test/2-query/irate.py
@@ -69,7 +69,7 @@ class TDTestCase:
                         comput_irate_value = origin_result[1][0]*1000/( origin_result[1][-1] - origin_result[0][-1])
                     else:
                         comput_irate_value = (origin_result[1][0] - origin_result[0][0])*1000/( origin_result[1][-1] - origin_result[0][-1])
-                    if abs(comput_irate_value - irate_value) <= 0.001:
+                    if abs(comput_irate_value - irate_value) <= 0.0000001:
                         tdLog.info(" irate work as expected , sql is %s "% irate_sql)
                     else:
                         tdLog.exit(" irate work not as expected , sql is %s "% irate_sql)