I am a newbie for unreal4 engine. I want to make a UI plugin for unreal. so does anyone can give me some tutorials or simple example coding for that. thank u very much.
Hello!
There are several resources available to you. I would start by reading the wiki entry here:
And of course Epic’s official documentation here:
Of course, the best tutorial you could ever have is in the source code itself. Browse to Engine/UE4/Plugins/ for Epic’s own in-engine plugins.
I would recommend the Plugins/Developer/BlankPlugin/ in particular as it’s their own “sample barebone plugin”
I wish you luck 
/Temaran
And if you run into any issues, please let me know. You can find me on IRC at almost all hours.
I am working on a second installment to the plugins tutorials expanding on the public API portion of a module - probably leading to splitting it into three different documents to help focus the writing and shorten the document up.
You can also have a look at the various third party plugins to see how they’ve been structured: A new, community-hosted Unreal Engine Wiki - Announcements and Releases - Unreal Engine Forums