Intermediate market books refer to large-scale distribution enterprises that connect upstream publishing houses and downstream retail bookstores in the book production and marketing supply chain, play the role of book commodity circulation, and have powerful functions such as comprehensive logistics, book industry information transmission and capital circulation. The book market structure refers to all kinds of books in the book market, their market share, advantages and disadvantages, existing problems and situations, and the comprehensive situation of the layout structure of the whole book market.