Abstract: When an electromagnetic suspension (EMS) maglev vehicle travels uphill or downhill, it repeatedly collides with the tracks of the maglev test line because of the rapidly changing track curvature; these collisions strongly and adverselyaffect the safety and comfort of the maglev system. To solve this problem, a dynamic model for a maglev vehicle track is established. The effects of the track slope, sensor installation position, vehicle quality, and vehicle speed on vehicle stability when a maglev train travels through a track grade change point are analyzed theoretically. In addition, the relation between the stability and the main parameters of the train track slope and the vehicles are deduced. The effectiveness of the stability condition is verified by numerical simulation. Theresults of this study may influence the futuredesign of maglev vehicles and track systems.