legal analysis: those who contract to operate canteens of centralized dining units shall obtain food business licenses according to law and be responsible for the food safety of canteens. At present, China implements a licensing system for food production and operation, and units engaged in food sales and catering service activities should obtain food business licenses according to law. Those who contract to operate canteens of centralized dining units also belong to the category of "engaged in food sales and catering service activities".

legal basis: article 28 of the regulations for the implementation of the food safety law of the people's Republic of China. canteens of schools, child care institutions, old-age care institutions, construction sites and other centralized dining units should implement systems such as raw material control, tableware cleaning and disinfection, and food sample retention, and regularly carry out self-inspection on food safety in canteens in accordance with the provisions of article 47 of the food safety law.

those who contract to operate the canteens of centralized dining units shall obtain the food business license according to law and be responsible for the food safety of the canteens. The centralized dining unit shall urge the contractor to implement the food safety management system and assume the management responsibility.