这个网站教程 好似比较好呢。。。比较简单 （关于nook显示中文 part2）

http://bookpa.com/book/BookNewsCon.php?cs=2&AutoNo=1778

How to use your NOOK to read Chinese!!!

Step 1)

Download the converting software "EasyPub"   
Link---->http://www.hi-pda.com/forum/viewthread.php?tid=645717&extra=page%3D1&page=1

Download the style.css file.
Link---->http://www.mediafire.com/?8wb5skzn8cb2exc

Step 2) Open your txt file and save as "UTF-8" encoding

Step 3) Prepare a "epub" format file....see the following pictures:

              Open Easypub......and browse your txt file

              Then, then you will get a "epub" format file, then follow steps from pictures below

Step 3) After you put the "epub" file into your nook, and open it...you will find out that...the text still are question marks.....

-now just touch anywhere on the screen, there will be a menu pop up on the bottom of your screen...

-choose the "Aa text" (the fourth one from left)

-you will see "Publisher Defaults" and a check box beside it. touch the box and let it appears as a check mark..

-now close the menu

-and your nook can show Chinese~~~haha~~~~~

（if you don't understand above, you could go to this liknk <http://www.by-smart.com/forum.php?mod=viewthread&tid=2430>, and go to Flood # 9......)