Magnesium metal is a new kind of light and corrosion resistant metal material developed in the 20th century, It has the advantages of low specific gravity, high strength per unit weight, high chemical stability and so on. As a result, aluminum-magnesium alloy and magnesium die casting are very popular.The application of magnesium is mainly concentrated in the four fields of magnesium alloy production, aluminum alloy production, steel desulfurization, and aviation and military industry, such as Automobile manufacturing, light industry, metallurgical industry, chemical industry, electronic industry and instrument manufacturing.