The hydrogen storage properties of Zr0.8Ti0.2(Ni0.6Mn0.3-xV0.1+xCr0.05)(2) (x = 0.0,0.05,0.15,0.2) alloys are reported in this paper. The effects of substitution of V for Mn atoms on phase structure and hydrogen storage properties are studied. The main phases were found to be C14 and C15 Laves phase. With increasing V content, abundance of C14 phase increases and that of C15 phase decreases. Pressure-composition isotherms indicate that substitution of V for Mn leads to a decrease of the hydrogen equilibrium pressure and an increase of maximum hydrogen storage capacity. It is found that the amount of solid solution phase (alpha phase) increases as the V content increases. Hydrogen Storage properties also vary with the reaction temperature. (C) 2002 International Association for Hydrogen Energy. Published by Elsevier Science Ltd. All rights reserved.