The cost of book purchase includes book purchase, transportation, customs duties, agency fees and taxes, among which book purchase is the most important cost. The money spent on books is influenced by many factors, such as the variety of books, publication year, copyright, print run, binding and so on. In addition, publishers, wholesalers and booksellers have different requirements for the purchase quantity, which also affects the purchase cost. In order to control the purchase cost, book buyers need to conduct market research, and then comprehensively consider factors such as budget and sales forecast to achieve the best purchase benefit.