Abstract: The effect of Ni addition on the electrochemical properties of the eletrode alloys Ti_0.39V_0.29Mn_0.12-Cr_0.2Ni_x（x=0-0.2） was studied. It was investigated by X-ray diffraction （XRD）, scanning electron microscope （SEM）, energy dispersive X-ray spectroscope （EDS）, pressure-composition-temperature（PCT） curves, discharge curves, electrochemical impedance spectra （EIS） and linear polarization curves.The results show that the discharge performance of Ti_0.39V_0.29Mn_0.12Cr_0.2 alloy electrode is very poor becauseof low electrochemical activity, which could be greatly improved by Ni addition. With increase of Ni con-tent, the discharge capacity of Ti_0.39V_0.29Mn_0.12Cr_0.2Nix （x=0～0.2） alloy electrodes increase first andthen decrease. When x=0.1, the maximum discharge capacity of 273mAh/g is achieved.