Two hydrogen storage alloys: (A) 33.5mass% Ti-34.7 mass% Cr-V; (13) 9.5mass% Ti-14.7mass% Cr-2mass% Mn-V are investigated. X-ray diffraction results indicate both alloys are bee phase, and only slightly different in lattice parameters. TEM analysis on alloy A determined that it is homogeneously bee structured with a lattice constant of 0.306 nm. The alloy B displayed a second phase in plate shape, which is identified as Ti-5% V. One of its lattice constants is determined to be 0.76nm from several sets of diffraction pattern. The hydrogen storing capability showed that alloy A could absorb 3.6% hydrogen in the first cycle, when breathing in H-2 at 25 degrees C and releasing out at 400 and 500 degrees C. The absorbing ability decreased progressively in the successive cycles, down to 3.0% at the fourth round. Hydrogen storage ability of alloy B is much markedly inferior to that of alloy A, possibly due to the plate shape, functionless Ti-5mass% V (c) 2007 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.