Application: magnesium and magnesium alloy as a green environment protection industry material, widely used not only instrument produce and military affairs industry, but also making magnesium alloy, used as reducer, deoxidizer, alterative in producing some alloy. Magnesium is a important material in avigation industry, magnesium alloy is widely used in making airplane, engine and other parts, it is also used in making optics instrument. As a strong reducer, it still used in producing Titanium, Zirconium, Beryllium, Uranium. Purity magnesium has a week intension, but magnesium alloy is a well light structural material, widely used in space technic, aviation, automobile and appearance bearing and other industry department.