The influence of multiple additions of two oxides, Cr₂O₃ and Nb₂O₅, as additives on the hydrogen sorption kinetics of MgH₂ after milling was investigated. We found that the desorption kinetics of MgH₂ were improved more by multiple oxide addition than by single addition. Even for the milled MgH₂ micrometric size powders, the high hydrogen capacity with fast kinetics were achieved for the powders after addition of 0.2mol% Cr₂O₃+1mol% Nb₂O₅. For this composition, the hydride desorbed about 5wt.% hydrogen within 20min and absorbed about 6wt.% in 5min at 300°C. Furthermore, the desorption temperature was decreased by 100°C, compared to MgH₂ without any oxide addition, and the activation energy for the hydrogen desorption was estimated to be about 185kJmol⁻¹, while that for MgH₂ without oxide was about 206kJmol⁻¹.