In general, the basic elements that make up a supply chain include: 1) Suppliers. Supplier refers to the enterprise that provides raw materials or parts and components to the manufacturer. 2) Manufacturer. The manufacturer is the product manufacturing industry. The most important aspect of product manufacturing, responsible for product production, development and after-sales service. 3) Distribution enterprise. Distribution companies are product distribution agents set up to deliver products to every corner of the business geographic area. 4) Retailers. A retail business that sells products to consumers. 5) Logistics companies: Logistics enterprise that is outside the above enterprise specializes in providing logistics service enterprise. Among them wholesale, retail, logistics industry can also be collectively referred to as the circulation industry.