You’re expected to use an absolute path to a http accessible image

• ![Alt desc](http://www.example.com/image.png)

If you’re willing to link against your own repository, you should use the raw url format.

For instance, the following markdown

• ![logo](https://github.com/libgit2/libgit2sharp/raw/master/square-logo.png)

should display the following image

Note: An alternate raw format is also supported. The image above can also be accessed through the following url: https://raw.github.com/libgit2/libgit2sharp/master/square-logo.png

Update

Following your comment.

The following markdown in basic_option.md won’t work.

• > ![Alt vmware](https://github.com/liangxiao3/redhat_note/blob/master/pic/basic_vmware.jpg "vmware tool")

Switching it to the markdown below should fix this
Indeed, you didn’t use the raw url format (see above)

• ![Alt vmware](https://github.com/liangxiao3/redhat_note/raw/master/pic/basic_vmware.jpg)