The activation performance of quenched Ti-28V-15Mn-10Cr alloy, surface modified by using ball-milling with 10wt.% LaNi 3 . 5 5 Co 0 . 7 5 Mn 0 . 4 Al 0 . 3 alloys was investigated. Compared with the plain Ti-28V-15Mn-10Cr alloy, the activation performance of the composite sample was remarkably improved. It was revealed that there is a layer of LaNi 3 . 5 5 Co 0 . 7 5 Mn 0 . 4 Al 0 . 3 nanoparticles with an average grain size about 30nm, covered on the surface of the composite sample. These nanoparticles accelerate the dissociation and absorption of hydrogen and then act as a window for hydrogen to enter the alloy bulk, resulting in an improvement of activation of the alloy.