Safe food mainly includes pollution-free agricultural products, green food and organic food. These three foods are like a pyramid. The foundation of the tower is pollution-free agricultural products, with green food in the middle and organic food on it. The higher the requirements, the stricter the requirements. Pollution-free agricultural products refer to agricultural products and their processed products that have been certified by the provincial agricultural administrative department and are allowed to use the pollution-free agricultural products logo, which are pollution-free, safe, and have excessive pesticides and heavy metals. Green food refers to pollution-free, safe, high-quality and nutritious food that is produced according to a specific mode of production and approved by a specialized agency (China Green Food Development Center). Organic food refers to all agricultural and sideline products produced, processed and strictly certified by specialized institutions (National Organic Food Development Center) in accordance with the production standards of organic agriculture, without using organisms and their products obtained through genetic engineering, and without using chemically synthesized pesticides, fertilizers, growth regulators, feed additives and other substances.