The thrust bearing is used to bear the axial thrust of the rotor in operation, and to determine and maintain the axial mutual position between the turbine rotor and cylinder. The thrust bearing can be set as a separate type, or can be combined with the support bearing as a whole, known as the combined type. According to the shape of the structure divided into multi-jaw and fan-shaped tile, now commonly used for the fan-shaped tile. The main structure is composed of working tile, non-working tile, adjusting gasket, mounting ring and so on. Ten to twelve working and non-working tiles are installed on both sides of the thrust disc. Each tile is installed on the mounting ring, the working tile bears the rotor forward axial thrust, the non-working tile bears the rotor reverse axial thrust.