Abstract: When a high-speed maglev train passes through tunnels, the bad aerodynamic effect on vehicle, tunnel and environment will be induced. The influence of the size, position and length of transverse passage on vehicle-tunnel coupling aerodynamic effect of 600 km/h high-speed maglev train is studied by numerical simulation, and the reliability of numerical simulation method is verified by moving model test. Research results show that when the width of circular arch transverse passage decreases from 3.8 m to 2.9 m, the pressure wave amplitude at the measuring points on train surface increases by 8.8%, the pressure wave amplitude at the measuring points of tunnel wall has almost no change, and the peak value of the micropressure wave at 20 m from the tunnel exit increases by 5.4%. When the transverse passage is located in the middle of the tunnel, the pressure wave amplitude of the measuring points on train surface is the smallest. The position of transverse passage has no impact on tunnel wall pressure wave amplitude and has little effect on the micro-pressure wave. As the length of transverse passage increases from 30 m to 50 m, the pressure wave amplitude of the measuring points on train surface increases by 11.8%, and the transverse passage length has little impact on tunnel wall pressure wave amplitude and micro-pressure wave.