Digitization is a perfect combination after the human abstraction and technological high development. We can pass the procedure of digitization to reappear everything. Textbook in the 21st century is expanded to the electronic textbook from the paper. Computer and technology are not only transmitted tools. The digital content should not change paper of this textbook directly to read on the computer either. The digital content should be an E-book. It must combine the high-quality course content material, and the high-quality teaching activity, and appropriate carriers.