Abstract: The electrochemical behaviour of AZ31 magnesium alloy in MgSO4,MgBr2 and Mg(ClO4)2 solutions was investigated by linear potential scan,constant current discharge,EIS impedance and weight loss measurements.The results showed that AZ31 magnesium alloy has better electrochemical characteristics in Mg(ClO4)2 solution i.e.,smaller corrosion rate,higher discharge efficiency,shorter discharge delay-time and discharge potential than in MgSO4 and MgBr2 solutions.