NOVELTY - The regulation method of magnesium aluminide (Mg17Al12) hydrogenation reaction involves: (1) uniformly mixing magnesium powder and aluminum powder to obtain mixed powder, performing cold pressing of mixed powder into circular sheet samples for 5 minutes under pressure of 20 MPa after mixing, then placing circular sheet samples in annealing furnace, carrying out thermal insulation in the presence of argon gas, then annealing circular sheet sample, processing, and breaking circular sheet samples after annealing treatment to obtain composite material powder.    USE - The method is useful for regulating Mg17Al12 hydrogenation reaction, where Mg17Al12 is useful in preparation of hydrogen storage material of fuel cell, and hydrogen storage system (claimed).    DETAILED DESCRIPTION - The regulation method of magnesium aluminide (Mg17Al12) hydrogenation reaction involves: (1) uniformly mixing magnesium powder and aluminum powder in molar ratio of 17:12 to obtain mixed powder, performing cold pressing of mixed powder into circular sheet samples for 5 minutes under pressure of 20 MPa after mixing, then placing circular sheet samples in annealing furnace, carrying out thermal insulation in the presence of argon gas at 600 degrees C for 2 hours, then annealing circular sheet sample, processing, and breaking circular sheet samples after annealing treatment to obtain composite material powder; (2) extracting portion of composite material powder obtained in step (1), carrying out X-ray powder diffraction, PCT and hydrogen absorption and desorption test, measuring X-ray powder diffraction spectra of Mg17Al12 before and after annealing treatment, post-annealing treatment, absorption and desorption, carrying out PCT test after annealing treatment to obtain Mg17Al12 PCT curve, and carrying out hydrogen absorption and desorption test after annealing treatment to obtain Mg17Al12 variable temperature hydrogen absorption and desorption curve; (3) extracting remaining composite material powder obtained in step (2) under argon atmosphere, carrying out planetary ball mill and milling at 300 rpm; and (4) collecting samples for 70 hours after milling, and finally carrying out X-ray powder diffraction, PCT and hydrogen absorption and desorption test. An INDEPENDENT CLAIM is included for use of Mg17Al12 in preparation of hydrogen storage material of fuel cell, and hydrogen storage system (claimed).