diff --git a/README.md b/README.md
index dff69ea..c73f07c 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,90 @@
-# nvjpeg
+# Image Decode Implementation with NVJpeg and CV2
+
+*author: Junjie Jiang*
+
+
+
+<br />
+
+
+
+## Description
+
+An image decode operator implementation with OpenCV and NvJpeg.
+The decoder will use GPU to decode jpeg images.
+
+Only supports linux.
+
+<br />
+
+
+
+## Code Example
+
+Load a image from path './dog.jpg'. 
+
+ *Write the pipeline in simplified style:*
+
+```python
+import towhee
+
+towhee.glob('./dog.jpg') \
+  .image_decode.nvjpeg() \
+  .show()
+```
+
+*Write a same pipeline with explicit inputs/outputs name specifications:*
+
+```python
+import towhee
+
+towhee.glob['path']('./dog.jpg') \
+  .image_decode.nvjpeg['path', 'img']() \
+  .select['img']() \
+  .show()
+```
+
+
+
+<img src="./show_result.jpg" height="150px"/>
+
+
+
+<br />
+
+
+
+## Factory Constructor
+
+Create the operator via the following factory method:
+
+***image_decode.nvjpeg()***
+
+
+
+<br />
+
+
+
+## Interface
+
+An image decode operator takes an image path as input. It decodes the image back to ndarray.
+
+
+
+**Parameters:**
+
+**img**: *str*
+
+​	Image file path.
+
+
+
+**Returns**: *towhee.types.Image (a sub-class of numpy.ndarray)* 
+
+​	The decoded image data as numpy.ndarray.
+
+
+
+