legal analysis: catering service providers should engage in catering service activities in accordance with laws, regulations, food safety standards and relevant requirements, and be responsible to the society and the public to ensure food safety.

Legal basis: Regulations for the Implementation of the Food Safety Law of the People's Republic of China

Article 4 A catering service provider shall engage in catering service activities in accordance with laws, regulations, food safety standards and relevant requirements, be responsible to the society and the public, ensure food safety, accept social supervision, and assume the responsibility for food safety in catering services.

Article 12 A catering service provider shall establish a system of purchasing, checking and obtaining certificates and tickets for food, food raw materials, food additives and food-related products. Where a catering service provider purchases from a food production unit or a wholesale market, it shall inspect, obtain and keep the supplier's relevant licenses and product qualification certificates; If purchasing from a fixed supplier or supply base, the qualification certificate of the supplier or supply base, each supply list, etc. shall be inspected, obtained and retained; Purchase from supermarkets, farmers' markets, self-employed merchants, etc., shall obtain and keep the purchase list. Catering service enterprises shall establish a procurement record system for food, food raw materials, food additives and food-related products. The purchase record shall truthfully record the product name, specification, quantity, production batch number, shelf life, supplier's name and contact information, purchase date and other contents, or keep the purchase bill containing the above information. Catering service providers shall sort out the purchase records and related materials in an orderly manner according to the product variety and the order of purchase time, and keep them properly for future reference. The retention period of records and bills shall not be less than 2 years.