Taking the high-speed maglev train as research object, the multi-body dynamic model of single vehicle and marshaling train were established. For the different running speeds, the line evaluation conditions of straight line and horizontal curves were set. The dynamic performances of maglev single vehicle model and train model were investigated under high-speed running conditions. The dynamic difference induced by the modeling method was analyzed from the aspects of levitation and guidance ability, vibration level and so on. The research showed that, the dynamic coupling effect between vehicles mainly affected the levitation performance. On straight line, the maximum increases of levitation force and gap calculated by the train model could reach 5 kN and 0.4 mm respectively compared with that of the single-vehicle model. In curve negotiation condition, the levitation force and carbody vertical acceleration obtained from the train model increased by about 5 kN and 0.09 m/s,2, respectively with respect to that of the single-vehicle model. The different modeling methods had little influence on the lateral dynamic interaction and vibration level of maglev vehicle.