Bearing is an important component, the turbine of a main bearing is also called the radial bearing.Its purpose is to carry the full weight of the rotor and the centrifugal force caused by the unbalance of the rotor quality, determine the rotor radial right position in the cylinder.Because each bearing under high load, and shaft speed is very high, so the turbine bearing are the theoretical basis of using liquid friction sliding bearing, bearing with the aid of a certain pressure of lubricating oil in the oil film between the journal and the bearing bush, liquid friction, the safe and stable operation of steam turbine.