Abstract: In order to prolong the service life and improve the efficiency of the high-speed EMU, the paper studied on the definition and application of industrial big data, fault prognostics and health management(PHM), PHM related standards and the foreign PHM software development platform, built up an integrated function structure of the ground and onboard fault prognostics and health management system based on big data, and put forward technical implementation plan. Based on the data of traction motor bearing temperature and ambient temperature, an example analysis was made on the temperature health state model of traction motor bearing.