In order to solve the problem of magnesium alloy low corrosion resistance,poor wear resistance and poor bond strength with organic coatings under marine climatic,ZM5 was selected for the research,three different surface treatment processing,micro-arc oxidation,chemical film and MIL-M-3171,DOW17 anodizing were used on the magnesium alloy,of which DOW17 and micro-arc oxidation sample were subjected for EDX and morphologies analyzed.Compared three different processing layers properties under the testing of neutral salt spray,micro-hardness,bond strength with organic coatings.Testing results indicated the micro-arc oxidation processing post with paints treated on magnesium alloy obtained the best overall performance,suitable for application in marine climate environment.