Abstract: To realize realtime monitoring of metro trains, taking the train remote operation and maintenance system of Wuhan Metro as the research object, the overall architecture is elaborated and key technologies such as mass data acquisition, vehicle-wayside wireless communication and real-time data processing are expounded. Based on Wuhan Metro Line 21, the real-time status display, fault remote diagnosis and daily maintenance management in actual application are explained in detail. Practical operation results show that Wuhan Metro train remote operation and maintenance system can provide comprehensive real-time data of lines and train equipment, improving the efficiency and accuracy of maintenance.