The paper mainly carries out the technical analysis on the causes of high oil temperature failure prevalent in HV-TURBO single-stage high-speed centrifugal blowers to put forward practical and feasi- ble measures and methods, and takes Shidongkou Sewage Treatment Factory to verify the implementation of project cases. Good achievements are obtained in production practice, which further clarifies the necessity of the analysis on the reasons of failures and measures, being great reference significance for the proper solution to problems of the same type of equipment under scheduled circumstances.