Abstract:The temperature rise of the bearing shell during operation of the water turbine generator sets is a common failure type of the turbine[1].It is pointed out that the failure of No. 2 hydro-generator set trip is caused by the abnormal increase of the temperature of the thrust tile of the water turbine generator set in puding hydropower station.The operation mode and failure process of the system before the fault was understood.All thrust tiles were checked for full inspection and it was found that the middle positions of 8 thrust tiles were badly worn.All worn thrust tiles were picked up but the effect was not beautiful.Therefore,the damaged thrust tiles were replaced by plastic tiles. The thrust watt was normal when the test ran and the obvious effect was achieved.After the failure,initial economic losses were estimated,the cause of the failure was deeply analyzed and the lack of equipment, management and technology was found.In order to prevent or avoid similar situations,ensure units safety, security, economic and efficient of power systemoperation,the preventive measures and key requirements have been put forward.It will create good conditions for the early realization of "remote set control and low maintenance" for puding hydropower station.This fault treatment method is worthy of reference for other types of water power plants (stations).We must guard against the similar situation to reduce the probability of similar failures and improve the safety level of power system.