I"m so happy, I got an answer from my friends. A lot of people will feel baffling on this matter when they choose the way of reading,hehe. But things will surely be easy for readers to download a free reading software on the user's pc,this ware is dubbed as "kindle for pc", with this tool, you can buy or enjoy free amaozn books without barrier even you are not a kindle owner.download freely on the place below, you will get the newest version.
http://www.epubsoft.com/soft/kindle-for-pc.html