diff --git a/das/src/main/java/com/das/modules/data/service/TDEngineService.java b/das/src/main/java/com/das/modules/data/service/TDEngineService.java
index e2fe31c1..e74f62fb 100644
--- a/das/src/main/java/com/das/modules/data/service/TDEngineService.java
+++ b/das/src/main/java/com/das/modules/data/service/TDEngineService.java
@@ -630,6 +630,10 @@ public class TDEngineService {
             }
         }
         sb.append(" order by t.event_time");
+        if (limit == null){
+            sb.append(" desc limit 100");
+            total = 100;
+        }
         if (limit != null){
             sb.append(" limit ").append(offset).append(",").append(limit);
              total = getEventCount(eventLevel,startTime,endTime,deviceCodeList);