In order to study the dynamic responses and influential mechanism of 40-metre simply supported beams with different types under the action of low-to-medium speed maglev train, based on the beam rail integration and beam on beam scheme, considering PID active suspension control and adopting modal synthesis theory, a precise dynamic interaction theoretical model of low-to-medium speed maglev train and simply supported beam system is established, and the reliability is verified based on Changsha maglev test. The dynamic response of 40-metre simply supported beams with two different types under the action of low-to-medium speed maglev train is analyzed and compared, and the influential mechanism of bridge types on the coupling vibration of the system is also discussed. The results show that compared with the beam on beam scheme, the vertical dynamic deflection of the beam rail integration scheme is greater, and the acceleration is smaller. The vertical displacement of the car body is more significant, and the acceleration is similar. Comprehensively， the beam rail integration scheme is better. The influence of bridge types on active suspension control system is marginal; in the beam on beam scheme, there are abundant high frequency local vibration modes of simply supported beams, which increases the bridge deformation and the vibration dominant frequency of bridge and vehicle body; type difference can affect the coupling vibration of maglev train-track-bridge system via wavelength effect and local vibration.