Abstract: The electrochemical corrosion and electrochemical cycle stability tests of Mg₂Ni-Ti hydrogen storage alloys with different contents of Ti were carried out.The results show that the addition of Ti as alloying element can improve the electrochemical corrosion resistance and electrochemical cycle stability of Mg₂Ni alloy.The content of Ti in the alloy is optimized at 0. 8%. In comparison to those of Mg₂Ni alloy without Ti,the corrosion potential shifts by 87 m V in positive direction and the decay rate of discharge capacity decreases from 86% to 47% when 0.8% of Ti is added for the alloy.