Abstract: In order to develop the urban straddle monorail and enhance the passenger ride comfort, it is necessary to analyze the influence of track beam bearing on the stability of straddle monorail. The dynamics simulation software is used to establish a vehicle-bridge coupling model for the simulation of track beam and bearing dynamics response. Then, the finite element software is used to analyze the harmonic response of track beam bearing, and the relationship between bearing stiffness, bearing span and the maximum car body vibration acceleration is explored, to study the influence of bearing parameters change on rail transit coupling vibration. Finally, the relationship curve of bearing parameters to the stability of straddle monorail is obtained, which provides a reference for the design of new type track rail beam bearing, and the proper selection of bearing stiffness and bearing span.