Stainless steel cookware has beautiful appearance and exquisite structure, and at the same time has the advantages of durability, corrosion resistance, rust resistance, easy processing, no deformation, etc., and is the mainstream product in the cookware market. However, stainless steel cookware conducts unevenly, so many brands of stainless steel pots use a three-layer composite bottom structure, and some brands also use a three-layer composite structure for the whole body. The three-layer composite structure is generally two layers of stainless steel and one layer of aluminum. It is formed at one time with high-tech technology, so that the pot is heated evenly and conducts heat quickly. Generally, it has many functions such as frying, frying, roasting and stewing. The use of the three-layer composite structure cooker can not only fully maintain the nutritional content of the food, but also maximize the health of the housewife.