Abstract: Taking the Zhongtang suspended monorail test line as the background, finite element software is adopted to build structure model, the dynamic responses under three kinds of train braking forces are calculated respectively. The results show that, under train braking forces, the longitudinal displacement of the track beam and the bottom shear of bridge pier increase in wave form; attenuation vibration appears in longitudinal direction on track bream when train braking completes on it; with the increase of braking force, the longitudinal displacement, velocity, acceleration of the track beam and bottom shear of bridge increase, and the amplitude of the track beam increases after the train braking is completed.