diff --git a/zc-business/src/main/resources/mapper/business/DcPerceivedEventsWarningMapper.xml b/zc-business/src/main/resources/mapper/business/DcPerceivedEventsWarningMapper.xml
index 5e1cad2e..f700924d 100644
--- a/zc-business/src/main/resources/mapper/business/DcPerceivedEventsWarningMapper.xml
+++ b/zc-business/src/main/resources/mapper/business/DcPerceivedEventsWarningMapper.xml
@@ -628,7 +628,7 @@
         UNION ALL SELECT 19 UNION ALL SELECT 20 UNION ALL SELECT 21
         UNION ALL SELECT 22 UNION ALL SELECT 23
         ) h
-        INNER JOIN dc_warning dw
+        LEFT JOIN dc_warning dw
         ON HOUR(dw.warning_time) = h.hour_num
         AND dw.warning_time >= DATE_FORMAT(#{currently}, '%Y-%m-01 00:00:00')
         AND dw.warning_time <  DATE_FORMAT(DATE_ADD(#{currently}, INTERVAL 1 MONTH), '%Y-%m-01')