Therefore, the Machinery Industry Society has long established a "trinity, linkage management" business model. "Trinity" is to develop store sales, online sales and direct sales with the help of the bookstore's logistics platform. "Joint operation" requires different businesses to adopt differentiated business strategies for different target customers. Shop sales mainly provide books and information products for readers, so that readers can experience the infinite charm of knowledge during the purchase process; Online sales rely on "China Science and Technology Golden Book Network" to provide all kinds of book information services for national science and technology workers; Direct selling is aimed at colleges and universities all over the country, providing library books and college teaching materials, and constructing a professional book sales model.