After continuous improvement, under the condition of modern industrial technology, the hub has become an integral component with perfect functions. It bears the functions of carrying vehicle weight, transmitting power and supporting tires. As a rotating moving part, the hub must meet the technical conditions of light weight, fatigue resistance and dynamic balance on the premise of certain stiffness. Compared with the past steel wheels, the weight of aluminum alloy wheels is greatly reduced: under the same size and strength, the mass of aluminum alloy wheels is about half of that of steel wheels. The lightweight aluminum alloy wheel hub can make the vehicle power performance better, and make the vehicle fuel-efficient and good heat dissipation.