Abstract: In order to fill the deficiency of data acquisition and monitoring in the process of EMU operation inspection and repair, based on the analysis of environmental factors and the comparative study of common indoor locating technologies, a locating scheme combining bluetooth and ultra wide band (UWB) technology was proposed.The field application shows that the scheme can effectively solve the problem of locating and monitoring in the process of inspection and repair operation, implement the function of monitoring and locating the faults in the process of inspection and repair operation, as well as the statistical and early warning function of railway line and operation time.