The influences of Y content x on the lattice parameters, thermodynamic properties, absorption kinetics, plateau characters and pulverization resistance of La1-x YxNi4.8 Mn0.2 （x = 0.2, 0.5） alloys are investigated. The experimental results show that with the increasing Y content, the absorption/desorption plateau pressure, the hysteresis factor and the plateau slope are enhanced, the absorption kinetics is reduced slightly and the hydrogen intake capacity is impaired while the pulverization resistance is improved obviously. It is found that the hysteresis factor has the same variation trend as full width at half maximum of （111） peak in the XRD patterns.
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