There are basically three channels for buying books: one is to buy directly from the publishing house; The second is to purchase goods from booksellers; Third, the wholesale market directly purchases goods. As an early bookstore, buying goods from the wholesale market is the most extensive practice, and cash transactions in the wholesale market can reduce the discount of 5~8 percentage points. In addition, when many new books were sold in the first round, the publishing society contracted some booksellers and gave them great discounts. If we maintain a good cooperative relationship with the powerful regular booksellers, we can take the lead in this market. What needs special attention is that both publishing houses, booksellers and wholesale markets basically adopt an "adjustable" book supply model, and the allocation price is discounted according to the existing books. However, if the book entered is a sample book or an out-of-print book, it will not be returned.