Abstract: To optimize the hydrogenation-dehydrogenation process for preparing titanium powders by self-propagating high-temperature synthesis (SHS) method, the traditional steel ball milling process was replaced by the new closed-loop air current grinding process, and the traditional evacuation process for dehydrogenation process was replaced by the decompression-ignition process. The microstructure, phase component, chemical composition, and particle size distribution of the samples prepared by the optimization process were studied. In the results, the hydrogen mass fraction in the titanium hydride samples is high (4.662%) after SHS hydrogenation, and the particle size distribution of the TiH₂ particles is uniform with the range of 40~250 μm after the closed-loop air flow grinding process. The new dehydrogenation process is beneficial to control the N, O, and C content in the titanium powder samples.