In order to study the oil film lubrication and cooling of the thrust bearing of a hydro-generator unit,the numerical simulation calculation model of the thrust bearing was established,the temperature and pressure distribution of the bearing were analyzed,and the deformation of the bearing pad was calculated based on the fluid-structure coupling method.The results show that the deformation of the thrust bearing bush is very small,and its impact on the safe operation of the bearing can be ignored.However,the maximum temperature of the thrust bearing at the outer diameter of the bearing pad has exceeded the safe operation range,and the high temperature area is large,which affects the safe operation of the bearing.The influence of the main operating parameters on the temperature of the thrust bearing was analyzed based on the orthogonal experiment method.It is found that the oil inlet pressure has the greatest impact on the bearing temperature,followed by the oil inlet pressure,and the mirror plate speed has little impact on the bearing temperature.With the increase of the oil inlet pressure and oil inlet temperature of the lubricating oil,the temperature of the thrust bearing pad will increase,and with the increase of the mirror plate speed,the temperature rise of the thrust bearing pad will decrease.The optimal working condition combination of thrust bearing was obtained through range analysis,which has certain guiding significance for the safe and stable operation of hydro-generator units.