In order to improve the electrochemical properties of Ti-based hydrogen storage alloys, the phase structure and electrochemical properties of the Ti0.3Zr0.225V0.25Mn0.25-xNi0.5Six hydrogen storage alloys were investigated by means of the substitution of Si for Mn. The results show that these alloys are all composed of C 14 Laves phase matrix with hexagonal structure and TiNi second phase with cubic structure. With the increase of content, the activation property of these alloys is decreased, while the cycle stability is improved to a high degree.