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A new MgH2-PrF3-Al-Ni composite was prepared by ball milling under hydrogen atmosphere.After initial dehydrogenation and rehydrogenation,Pr3Al11,MgF2,PrH3 and Mg2NiH4 nanoparticles formed accompanying the main phase MgH2.The hydrogen absorption-desorption properties were measured by using a Sieverts-type apparatus.The results showed that the MgH2-PrF3-Al-Ni composite improved cycle stability and enhanced hydrogen desorption kinetics.The improvement of hydrogen absorption-desorption properties is ascribed to the synergetic effect of the in situ formed Pr3Al11,MgF2,PrH3 and Mg2NiH4 nanoparticles.This work provides an important inspiration for the improvement of hydrogen storage properties in Mg-based materials.