A new process of micro-arc oxidation was developed and it could improve the corrosion resistance of magnesium alloys considerably according to potendynamic polarization curves and salt spray test.In addition,micro-arc anodization of wheels and motor parts were studied in the process in order to lay foundations for industrial use of the technology.Anodic coating is compact and uniform on the surface of samples after anodization.The colour of anodic coating is white and beautiful.