Tenderloin is one of the most tender parts of pigs, with tender meat and excellent taste. It is suitable for cooking all kinds of dishes, such as frying, boiling and stewing. And can keep its tender and smooth characteristics in cooking. Because of its high popularity and relatively small supply, it is more expensive. Tendon meat is also one of the parts from pigs, but it is slightly rough in texture and taste compared with tenderloin. In common use, Tongji can give full play to its characteristics and provide delicious food choices. Because the pricing of the two is different under different demands, and the market demand will also affect the price formation mechanism.