Abstract: The effects of arc spraying distance and spraying voltage on the microstructure, microhardness, salt spray corrosion resistance and electrochemical properties of AZ31 alloy used for exhibition design were studied. The results show that when the spraying distances were 120 mm, 150 mm and 180 mm, with the decreasing of spraying voltage, the microhardness of the surface coating increased first and then decreased as a whole and the maximum microhardness was obtained when the spraying voltage was 28 V; at the same spraying distance, with the decreasing of spraying voltage, the average corrosion depth of coating was the minimum when the spraying voltage was 28 V; when the spraying distance was 150 mm and the spraying voltage 28 V, the corrosion potential of the coating was obviously higher than those of other arc spraying processes, which was an appropriate arc spraying process for AZ31 alloy; the self corrosion potential of the coating obtained by arc spraying was significantly higher than that of AZ31 magnesium alloy substrate, and the corrosion resistance was improved obviously.