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 a0cbdb5190..30800244d6 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
@@ -87,7 +87,7 @@ public class TaosDemoApplication {
 
         start = System.currentTimeMillis();
         // multi threads to insert
-        int affectedRows = subTableService.insertAutoCreateTable(superTableMeta, threadSize, tableSize, startTime, gap, config);
+        int affectedRows = subTableService.insertMultiThreads(superTableMeta, threadSize, tableSize, startTime, gap, config);
         end = System.currentTimeMillis();
         logger.info("insert " + affectedRows + " rows, time cost: " + (end - start) + " ms");
         /**********************************************************************************/
@@ -100,7 +100,7 @@ public class TaosDemoApplication {
 
     private static long getProperStartTime(long startTime, int keep) {
         Instant now = Instant.now();
-        long earliest = now.minus(Duration.ofDays(keep)).toEpochMilli();
+        long earliest = now.minus(Duration.ofDays(keep+1)).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 5b99bf3558..af96761331 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
@@ -76,7 +76,7 @@ public class SubTableService extends AbstractService {
         return mapper.insertMultiTableMultiValuesUsingSuperTable(subTableValues);
     }
 
-    public int insertAutoCreateTable(SuperTableMeta superTableMeta, int threadSize, long tableSize, long startTime, long gap, JdbcTaosdemoConfig config) {
+    public int insertMultiThreads(SuperTableMeta superTableMeta, int threadSize, long tableSize, long startTime, long gap, JdbcTaosdemoConfig config) {
         long start = System.currentTimeMillis();
 
         List<FutureTask> taskList = new ArrayList<>();
diff --git a/tests/examples/JDBC/taosdemo/src/main/java/com/taosdata/taosdemo/utils/SqlSpeller.java b/tests/examples/JDBC/taosdemo/src/main/java/com/taosdata/taosdemo/utils/SqlSpeller.java
index d41bba589c..a60f0641d3 100644
--- a/tests/examples/JDBC/taosdemo/src/main/java/com/taosdata/taosdemo/utils/SqlSpeller.java
+++ b/tests/examples/JDBC/taosdemo/src/main/java/com/taosdata/taosdemo/utils/SqlSpeller.java
@@ -141,10 +141,6 @@ public class SqlSpeller {
 
 
     public static String createTable(TableMeta tableMeta) {
-//        create table if not exists ${database}.${name}
-//        <foreach collection="fields" item="field" index="index" open="(" close=")" separator=",">
-//                ${field.name} ${field.type}
-//        </foreach>
         StringBuilder sb = new StringBuilder();
         sb.append("create table if not exists ").append(tableMeta.getDatabase()).append(".").append(tableMeta.getName()).append(" ");
         String fields = tableMeta.getFields().stream()