A new generation high-speed electromagnetic suspension (EMS) Maglev engineering prototype vehicle is developed in China in recent year. However, the domestic high-speed maglev prototype is not tested at the speed of 600 km/h due to the lack of a long-distance engineering test line. Therefore, it is necessary to conduct corresponding prediction and evaluation through numerical simulation. At the same time, the threshold of track irregularity at the speed of 600 km/h is also not clear due to the lack of a test line. In response to the above problem, a vehicle-magnetic force-track coupling dynamics simulation model for high speed EMS Maglev was established by jointly using UM, ANSYS and Simulink software in this thesis. The simulation model was verified through actual measurement data of Shanghai high speed Maglev demonstration line. The dynamic response of the vehicle subsystem, suspension subsystem and track beam subsystem of the high-speed maglev at the speed of 600 km/h was analyzed by this model. On this basis, the threshold for track irregularity at the speed of 600 km/h was explored by dynamic calculation. This thesis has conducted meaningful exploration and practice in the establishment of coupling model, the evaluation of system dynamic performance and the analysis of the threshold for high-speed Maglev track at the speed of 600 km/h.