Canned food belongs to the 29th category of registered trademarks. Canned food refers to food made from raw materials after treatment, canning, sealing, sterilization or aseptic packaging. Canned food can be stored at room temperature for a long time because it is commercially sterile. Canned food is a special kind of food preservation method. Because all kinds of canned food can be stored for a long time at room temperature, it is convenient to carry, transport and store, omitting the cooking procedure, overcoming the seasonal and geographical restrictions on the supply of food varieties, and it is deeply loved by consumers, especially meeting the special needs of outdoor adventure, ocean voyage, mountaineering adventure and other difficult conditions.