Legal basis: Article 50 of the Food Safety Law of People's Republic of China (PRC) stipulates that when purchasing food raw materials, food additives and food-related products, food producers should check the supplier's license and product qualification certificate; Food raw materials that cannot provide qualified certificates shall be inspected in accordance with food safety standards; It is forbidden to purchase and use food raw materials, food additives and food-related products that do not meet food safety standards. Food production enterprises shall establish a record system for incoming inspection of food raw materials, food additives and food-related products, truthfully record the name, specification, quantity, production date or production batch number, shelf life, purchase date, supplier name, address and contact information, and keep relevant vouchers. The storage period of records and vouchers shall not be less than six months after the expiration of the product shelf life; If there is no clear shelf life, the shelf life shall not be less than two years.