diff --git a/rsqldb-disk/conf/rsqldb.conf b/rsqldb-disk/conf/rsqldb.conf
index bff3d34..03ee644 100644
--- a/rsqldb-disk/conf/rsqldb.conf
+++ b/rsqldb-disk/conf/rsqldb.conf
@@ -1,4 +1,6 @@
+#RocketMQ集群中namesrv地址
 NAMESRV_ADDR=127.0.0.1:9876
+#流处理任务命名空间
 namespace=test
 
 ## 流计算经过任务解析器（rsqldb-server）解析后保存位置，可以是memory, DB 或者file
@@ -11,9 +13,9 @@ jdbc.password=
 
 
 ## 窗口配置
-#group by 时窗口大小，单位s，sql中不配置或者这里不指定的话默认600s
-dipper.window.default.iterval.size.time=10
+#group by 时窗口大小，单位s，默认为10s
+window.default.iterval.size.time=
 
 #client产生的流计算任务位置，目前需要填绝对路径,client生成后，runner从该位置读取流计算任务。配置形式为：
 #filePathAndName=/Users/rsqldb/rsqldb-disk/server/rsqldb.cs
-filePathAndName=/Users/nize/code/github/rsqldb/rsqldb-disk/server/rsqldb.cs
+filePathAndName=
diff --git a/rsqldb-parser/src/main/java/com/alibaba/rsqldb/parser/parser/function/HopParser.java b/rsqldb-parser/src/main/java/com/alibaba/rsqldb/parser/parser/function/HopParser.java
index bbdf294..1053efe 100644
--- a/rsqldb-parser/src/main/java/com/alibaba/rsqldb/parser/parser/function/HopParser.java
+++ b/rsqldb-parser/src/main/java/com/alibaba/rsqldb/parser/parser/function/HopParser.java
@@ -44,17 +44,20 @@ public static com.alibaba.rsqldb.parser.parser.builder.WindowBuilder createWindo
         /**
          * 如果只有group by，没有指定窗口，则通过配置获取默认窗口大小，如果未指定，默认1个小时
          */
-        int interval = WindowBuilder.getIntValue(ConfigureFileKey.DIPPER_WINDOW_DEFAULT_INERVAL_SIZE, 60 * 10);
+        int interval = WindowBuilder.getIntValue(ConfigureFileKey.DIPPER_WINDOW_DEFAULT_INERVAL_SIZE,  10);
         com.alibaba.rsqldb.parser.parser.builder.WindowBuilder windowBuilder = new com.alibaba.rsqldb.parser.parser.builder.WindowBuilder();
 
         SqlWatermark sqlWatermark = ThreadLocalUtil.watermarkHolder.get().get(builder.getSourceTable());
-        int watermarkOffset;
-        try {
-            watermarkOffset = (int)sqlWatermark.getWatermarkOffset();
-        } catch (Throwable e) {
-            throw new RuntimeException(e);
+
+        if (sqlWatermark !=null) {
+            int watermarkOffset;
+            try {
+                watermarkOffset = (int)sqlWatermark.getWatermarkOffset();
+            } catch (Throwable e) {
+                throw new RuntimeException(e);
+            }
+            windowBuilder.setWatermark(watermarkOffset);
         }
-        windowBuilder.setWatermark(watermarkOffset);
 
         windowBuilder.setType(IWindow.HOP_WINDOW);
         windowBuilder.setOwner(builder);