The first is the production line: outside the factory stands four milk tanks, each of which can store 40 tons of milk. The milk tanker transported from the pasture inputs the milk into the milk tank, which continuously provides basic raw materials for production. The specific milk production process is very complex, which probably includes raw milk weighing, raw milk inspection, filtration, cooling, storage, preheating, milk purification, concentration, pasteurization, cooling, storage, preheating, degassing, homogenization, pre insulation, UHT sterilization, cooling, aseptic transportation, aseptic filling, code spraying, packing, stacking, heat preservation test, and then leaving the factory. Among them, raw milk weighing Filtration and cooling will be completed quickly in the pasture, and the temperature of the milk loaded on the milk tanker is already 4 ℃ of the cooling temperature. Inspection is a very necessary process, especially for our students majoring in food quality and safety. The detection of raw milk is mainly aimed at sensory, acidity, fat, whole milk solid, adulteration (water, alkali, starch, salt, nitrite), alcohol test, boiling test, protein and other indicators. After the disinfection and sterilization process, sensory evaluation, physical and chemical control, microbial detection and other steps will be carried out.