Adobe designed the PDF file format in order to support cross-platform, multimedia integration of information publishing and distribution, in particular, to provide support for network information distribution. In order to achieve this purpose, PDF has many other electronic document format can not be compared to the advantages of PDF file format can be text, font, format, color and independent of the device and resolution of the graphic images encapsulated in a file. The format file can also contain hypertext links, sound and moving images and other electronic information, support for extra-long documents, integration and security and reliability are high. For ordinary readers, with PDF e-books produced with the texture of the paper book and reading effect, you can "realistically" show the original appearance of the original book, while the display size can be adjusted to give readers a personalized way of reading. As PDF files can not rely on the operating system language and fonts and display devices, it is easy to read. These advantages so that readers can quickly adapt to e-reading and online reading, undoubtedly conducive to the popularity of computers and networks in daily life.