Ball/roller combination slewing bearing is composed of outer seat-ring, inner seat-ring, ball and roller. The rollers and balls are respectively on a horizontal line rollway of ourer seat-ring and global rollway of inner seat-ring. The rollers load the axial moment and the balls load the radial moment, while both of them load the torque moment. So ball/roller combination slewing bearing can not only load axial moment, but also certain torque moment and radial moment.