As a degradable medical material, medical magnesium alloy is known as the third generation biomedical material. Magnesium is an element that is mild to the human body and has good absorbability and biocompatibility. In orthopedic implants, it has a density and elastic modulus close to that of bone. Medical magnesium alloys also have a controllable corrosion rate and have good application prospects in cardiovascular implants and bone repair. The magnesium alloys studied mainly include WE43, AZ31, Mg-Ca, MgZnCa and so on. The main problems of medical magnesium alloys are too fast corrosion rate and insufficient mechanical strength.