diff --git a/set_publish_frequency.md b/set_publish_frequency.md
index 3da65ba..ee0a3cd 100644
--- a/set_publish_frequency.md
+++ b/set_publish_frequency.md
@@ -1,11 +1,11 @@
 
 # Set publish frequency
 
-## 2.1 Git clone livox_ros_driver
+## 1. Git clone livox_ros_driver
 
 `git clone https://github.com/Livox-SDK/livox_ros_driver.git ws_livox/src`
 
-## 2.2 Set publish frequency
+## 2. Set publish frequency
 
 Take the conversion of lvx files to rosbag files as an example :
 
@@ -13,11 +13,11 @@ If you need to convert rosbag data with the frequency to 10Hz, please set the 
 
 ![Set frequency](image_ros/set_freq.png)
 
-## 2.3 Open a terminal window under this path
+## 3. Open a terminal window under this path
 
 `../ws_livox`
 
-## 2.4 Convert lvx point cloud data file (v1.0/v1.1) to rosbag file
+## 4. Convert lvx point cloud data file (v1.0/v1.1) to rosbag file
 
 livox_ros_driver supports the conversion of lvx pointcloud data files to rosbag files. Use the command as follows :
 
@@ -29,6 +29,6 @@ After replacing "/home/livox/test.lvx" in the above command with the local lvx d
 
 ![Convert lvx file](image_ros/lvx_to_rosbag_02.png)
 
-## 2.5 Playing the Rosbag data
+## 5. Playing the Rosbag data
 
 ![Play rosbag file](image_ros/play_rosbag_file_01.png)