Aluminum alloy wheel is widely used in modern domestic automobile and mainstream German automobile. Because it does not need high cost, it is widely used at present. Aluminum alloy hub has strong thermal conductivity, and compared with traditional carbon steel material, aluminum alloy hub weight is lighter, has better heat dissipation. Aluminum alloy wheel has relatively small inertia resistance, tire resistance is reduced in the process of high-speed driving, which can promote the car fuel consumption to be reduced. Compared with carbon steel material, aluminum alloy has higher thermal conductivity, not only the automobile braking performance is enhanced, the service life of tires, brake disc brake can also be extended.