Magnesium is a kind of light metal raw material for the production of magnesium alloy products. It has the advantages of high specific strength, high specific stiffness, good thermal conductivity and conductive property, good electromagnetic shielding, damping, machinability and low processing cost. The processing energy is only 70% ofaluminum alloy and easy to recover. As a metal structure material with the smallest density, magnesium is widely used in aerospace industry, military industry and transportation (including automobile industry,aircraft industymotorcycle industry, bicycle industry, etc.), and 3C fields. With the development of science and technology andthe emergence of new technologies and new technologies, the application of metal magnesium will be more and more extensive.