Because of the impact resistance of magnesium and magnesium alloys, if they can develop magnesium alloys which have the same corrosion resistance as aluminum alloys, they will have broad application prospects in various military fields, such as weapons. Such as flares with magnesium, penetrator with high strength magnesium alloy sabot material and available magnesium alloy manufacturing tactical air missile cabin, aileron skin, siding and magnesium alloy cassion beam with radar, satellite, camera and shell parts etc.. Lightweight weapons are the development trend of modern weapons. The use of magnesium alloys to replace some of the components of existing weapons is becoming the focus of research in various countries. The relevant units have been respectively by forging or casting method developed magnesium alloy bolt box, submachine gun tail, handle, armrest, support plate, elastic body, a sight seat, seat and a small magazine protection casting alloy engine inlet pipe and engine filter seat and other military weapons components, part of a method for protection of corrosion and wear resistance of magnesium alloy components was also higher requirements through the union of the coating were the corresponding surface treatment. At present, these R & D and production of military magnesium alloy parts have entered the actual demonstration, verification and assessment stage, and is expected to be preliminary application soon.