Green food does not refer to the food with green color, but to the safe, high-quality and nutritious and non-polluted food which is produced with special production manner, authorized by special organ to use the label of green food. The food can be vegetables, fruits, aquatic products, and meat. Green food is categorized into Grade AA and Grade A. the former refers to the food which is produced without any hazardous chemicals and the latter refers to those in whose production process, limited amount of chemical synchesis matter is permitted to employ. Anyway, green food is safe, sanitary and nutritious, which has gained good comment from consumers with its distinctive image of non-pollution and non-hazard. Its market coverage is gaining with each passing day with increasing market share, and quite a number of green food has entered the market of such developed countries as Japan and America, etc.