diff --git a/doc/doc_en/data_annotation_en.md b/doc/doc_en/data_annotation_en.md
index bec568adf107dccb0752ca74a090507007a68b7d..176aa6d53be69771edd4187c9693fd39179d112f 100644
--- a/doc/doc_en/data_annotation_en.md
+++ b/doc/doc_en/data_annotation_en.md
@@ -1,35 +1,20 @@
 # DATA ANNOTATION TOOLS
-
 There are the commonly used data annotation tools, which will be continuously updated. Welcome to contribute tools~
 
-## 1. labelImg
-
-* Tool description: Rectangular label
-
-* Tool address:  https://github.com/tzutalin/labelImg
-
-* Sketch diagram:
-
-  ![labelimg](../datasets/labelimg.jpg)
-
-
-
-## 2. roLabelImg
-
-* Tool description: Label tool rewritten based on labelImg, supporting rotating rectangular label
-
-* Tool address:   https://github.com/cgvict/roLabelImg
-
-* Sketch diagram:![roLabelImg](../datasets/roLabelImg.png)
-
-
-
-## 3. labelme
-
-* Tool description: Support four points, polygons, circles and other labels
-
-* Tool address:   https://github.com/wkentaro/labelme
-
-* Sketch diagram:
-
-  ![labelme](../datasets/labelme.jpg)
+### 1. labelImg
+- Tool description: Rectangular label
+- Tool address:  https://github.com/tzutalin/labelImg
+- Sketch diagram:  
+![labelimg](../datasets/labelimg.jpg)
+
+### 2. roLabelImg
+- Tool description: Label tool rewritten based on labelImg, supporting rotating rectangular label
+- Tool address:   https://github.com/cgvict/roLabelImg
+- Sketch diagram:  
+![roLabelImg](../datasets/roLabelImg.png)
+
+### 3. labelme
+- Tool description: Support four points, polygons, circles and other labels
+- Tool address:   https://github.com/wkentaro/labelme
+- Sketch diagram:  
+![labelme](../datasets/labelme.jpg)