In the present work, dehydrogenation behavior of LiAlH₄ (lithium alanate) doped with activated carbon has been investigated by pressure-composition-temperature, temperature programmed desorption, differential scanning calorimetry and X-ray Diffraction. The addition of activated carbon decreases the dehydrogenation temperature and enhances dehydrogenation kinetics of LiAlH₄. The onset decomposition temperature of doped LiAlH₄ sample is reduced to 90 ℃, which is much lower than that of 150 ℃ for pure LiAlH₄. The doping of activated carbon also effectively reduces the activation energy for the first and the second dehydrogenation reactions of LiAlH₄.