Abstract: This article processed and analyzed the massive data generated during the EMU operation and maintenance, and solved the problem that data can not be converted into available results.Relying on the big data analysis software Tableau and according to the process of big data analysis, the brake wear rate, wear difference, partial wear and other aspects were displayed. At the same time, the fault distribution was marked with the map and GPS coordinates.The analysis results show that the big data processing technology can improve the efficiency and accuracy of data analysis.