Abstract: Objective For the CR400BF EMU（electrical multiple units） operating at 350 km/h under wind-rain coupled conditions, there is a lack of simulation and experimental research data on the aerodynamic pressure acting on wipers. It is necessary to conduct simulation analysis to effectively evaluate the structural safety of wipers during high-speed operation. Method A CFD（computer fluid dynamics） simulation software is employed to analyze the flow field distribution law and the aerodynamic pressure on wipers under wind-rain coupled conditions. Based on the research results of aerodynamic pressure, structural analysis is further performed on the wiper system to determine the torque value exerted at the wiper’s rotating shaft in the wind-rain coupled environment. Result ＆ Conclusion Under no-rain and short-term heavy rainfall conditions, the flow field moves upwards along the train head surface, with densely distributed streamlines and higher flow velocities. The wiper arm rotation angle has minimal impact on the flow field and aerodynamic pressure of the train head in such condition. Since flow field distributions exhibit similarity across different wiper arm rotation angles, the raindrop motion negligibly influences the flow field of wiper. Under no-rain condition, the maximum torque occurs at a wiper arm angle of 0 degree, and the torque on Wiper Arm 2 reaches 28.9 N·m; the torque decreases to approximately 10.0 N·m at wiper arm rotation angles of 25 and 50 degrees. Under short-term heavy rainfall condition, wiper arm torque increases significantly. The maximum torque occurs at rotation angle of 0 degree, with Wiper Arm 2 torque reaching 103.1 N·m.