The hydrogen storage capacity of transition metal Ti atoms decorated porous fullerene C24B24 is investigated by the pseudopotential density functional method. The C24B24 cage contains six B-4 rings with the average diameter of 3.88 angstrom. The Ti atoms are strongly bound to six B-4 rings. Each Ti atom can adsorb up to six H-2 molecules. The calculated average adsorption energies per H-2 for (Ti-nH(2))(6)C24B24(n = 1-6) are in the energy range from 0.24 to 0.55 eV, which is suitable for hydrogen storage at near-ambient conditions. The Dewar-Kubas interaction dominates the adsorption of H-2 on the outer surface of Ti6C24B24. The largest hydrogen gravimetric density of (Ti-H-6(2))(6)C24B24 is 8.1 wt%, exceeding the 5.5 wt% by the year 2017 specified by the US department of energy (DOE). Therefore, the stable Ti6C24B24 can be applied as one candidate for hydrogen storage materials at near-ambient conditions. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.