more than p>25 meters. According to the inquiry about the food safety operation standard of catering service, catering enterprises should choose a place suitable for their meals and keep the environment clean. Do not choose areas that are susceptible to pollution. It should be more than 25m away from pollution sources such as cesspits, sewage pools, exposed garbage dumps (stations) and dry toilets, and outside the influence range of dust, harmful gases, radioactive substances and other diffuse pollution sources.