diff --git a/tests/examples/JDBC/taosdemo/src/main/java/com/taosdata/taosdemo/service/SubTableService.java b/tests/examples/JDBC/taosdemo/src/main/java/com/taosdata/taosdemo/service/SubTableService.java
index b0a9dacbc8ea32c4a42f1a5b0728bf0f4efb74d7..62d5337aed26f70a314b7863340fa5cd7ab4a4cf 100644
--- a/tests/examples/JDBC/taosdemo/src/main/java/com/taosdata/taosdemo/service/SubTableService.java
+++ b/tests/examples/JDBC/taosdemo/src/main/java/com/taosdata/taosdemo/service/SubTableService.java
@@ -56,9 +56,7 @@ public class SubTableService extends AbstractService {
         ExecutorService executor = Executors.newFixedThreadPool(threadSize);
         Future<Integer> future = executor.submit(() -> insert(subTableValues));
         executor.shutdown();
-
-        //TODO：
-        sleep(1000);
+        //TODO：frequency
         return getAffectRows(future);
     }
 
@@ -67,7 +65,6 @@ public class SubTableService extends AbstractService {
         ExecutorService executor = Executors.newFixedThreadPool(threadSize);
         Future<Integer> future = executor.submit(() -> insertAutoCreateTable(subTableValues));
         executor.shutdown();
-
         return getAffectRows(future);
     }