General food factory clean workshop can be roughly divided into three areas: general operation area, quasi cleaning area, clean operation area. General operation area (non-clean area) : general raw materials, finished products, tools storage area, packaging finished goods transport area and other raw materials, finished products exposed to low risk of the area, such as outer packing room, raw materials warehouse, packaging materials warehouse, outer packing workshop, finished products warehouse. Quasi-clean area: the next requirement, such as raw material processing, packaging material processing, packaging, buffer room (unpacking room), general production and processing room, non-ready-to-eat food inner packing room and other finished products processing but not directly exposed area.Cleaning area: refers to the highest health environment requirements, personnel, environmental requirements are higher, must go through disinfection and clothing can enter, such as: raw materials, finished products exposed processing area, food cold processing room, ready-to-eat food cooling room, ready-to-eat food storage room, ready-to-eat food packaging room. In the site selection, design, layout, construction and transformation of food factories with clean workshops, pollution sources, cross contamination, mixing and errors should be avoided to the greatest extent. The environment of the factory area is clean, and the flow of people and logistics are reasonable. Appropriate access control measures shall be taken to prevent unauthorized access. Keep completion data of construction and construction Buildings with serious air pollution in the production process shall be built on the downwind side of the factory where the wind direction is the maximum all the year round. When mutually influencing production processes are not suitable to be located in the same building, effective partition measures shall be taken between the respective production areas.The production of fermentation products should have a special fermentation workshop.