diff --git a/tests/examples/JDBC/taosdemo/src/main/java/com/taosdata/taosdemo/TaosDemoApplication.java b/tests/examples/JDBC/taosdemo/src/main/java/com/taosdata/taosdemo/TaosDemoApplication.java
index 502936c9611f01e82811a3decf0760d03f03b673..a0cbdb5190dca6a2512327e017437ab7c6bb55fc 100644
--- a/tests/examples/JDBC/taosdemo/src/main/java/com/taosdata/taosdemo/TaosDemoApplication.java
+++ b/tests/examples/JDBC/taosdemo/src/main/java/com/taosdata/taosdemo/TaosDemoApplication.java
@@ -79,7 +79,7 @@ public class TaosDemoApplication {
         // 插入
         long tableSize = config.numOfTables;
         int threadSize = config.numOfThreadsForInsert;
-        long startTime = getProperStartTime(config);
+        long startTime = getProperStartTime(config.startTime, config.keep);
 
         if (tableSize < threadSize)
             threadSize = (int) tableSize;
@@ -98,10 +98,9 @@ public class TaosDemoApplication {
         System.exit(0);
     }
 
-    private static long getProperStartTime(JdbcTaosdemoConfig config) {
+    private static long getProperStartTime(long startTime, int keep) {
         Instant now = Instant.now();
-        long earliest = now.minus(Duration.ofDays(config.keep)).toEpochMilli();
-        long startTime = config.startTime;
+        long earliest = now.minus(Duration.ofDays(keep)).toEpochMilli();
         if (startTime == 0 || startTime < earliest) {
             startTime = earliest;
         }
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 95887137a2b0cd0006d22fad0676054ea23fa842..5b99bf3558db801348b76a67e966355eec30b8e4 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
@@ -63,7 +63,7 @@ public class SubTableService extends AbstractService {
 
     // 插入: 多表，insert into xxx values(),()... xxx values(),()...
     public int insert(List<SubTableValue> subTableValues) {
-        return mapper.insertMultiTableMultiValuesUsingSuperTable(subTableValues);
+        return mapper.insertMultiTableMultiValues(subTableValues);
     }
 
     // 插入：单表，自动建表, insert into xxx using xxx tags(...) values(),()...
diff --git a/tests/examples/JDBC/taosdemo/src/test/java/com/taosdata/taosdemo/utils/TimeStampUtilTest.java b/tests/examples/JDBC/taosdemo/src/test/java/com/taosdata/taosdemo/utils/TimeStampUtilTest.java
index 628594c4b18008fd9e278bb6d23d0d5f87489b56..195db2b13efaec5b9d2451fbaff9c36f2bc41ac8 100644
--- a/tests/examples/JDBC/taosdemo/src/test/java/com/taosdata/taosdemo/utils/TimeStampUtilTest.java
+++ b/tests/examples/JDBC/taosdemo/src/test/java/com/taosdata/taosdemo/utils/TimeStampUtilTest.java
@@ -17,6 +17,9 @@ public class TimeStampUtilTest {
 
     @Test
     public void longToDatetime() {
+        System.out.println(TimeStampUtil.longToDatetime(1293244920052l));
+
+
         String datetime = TimeStampUtil.longToDatetime(1510000000000L);
         assertEquals("2017-11-07 04:26:40.000", datetime);
         long timestamp = TimeStampUtil.datetimeToLong(datetime);