The turbocharger bearing consists of deep groove ball bearings, cylindrical roller bearings, duplex mounting angular contact ball bearing and special type of duplex mounting angular contact ball bearings. The deep groove ball bearing and cylindrical roller bearing mainly take radial loading with high limiting speed; the duplex mounting angular contact ball bearing can take the radial and axial loading at the same time with slight movement. As far as higher turning speed and greater loading bearing is concerned, material of cages utilizes adopts steel and be specially treated to the cover.