The main development trend of metal materials in the world since the 90 s show that iron and steel, copper, lead, zinc, aluminum and other materials application showed a trend of decline or slow growth, and magnesium is continuous maintained rapid growth rate of more than 20% a year, the reason is that magnesium alloy as the lightest engineering metal materials (two-thirds of magnesium density 1.8, for aluminum, steel 1/4). It has a series of advantages, such as light specific gravity, high specific strength and stiffness, good damping and cutting ability, good thermal conductivity, strong electromagnetic shielding ability, and good vibration reduction and easy recovery. It meets the requirements of weight reduction, energy saving, environmental protection and communication electronic devices, which are highly integrated and lightweight and miniaturized. In the automobile, motorcycle industry and information industry and other fields have been increasingly widely used.