A finite-element simulation is carried out for the rigid support and elastic support of rail beams under traveling mechanical load with the ANSYS software,deducing the internal forces and the reaction of supports in different calculation models.A comparative analysis is conducted for the results of different models,and the influence from the change of supports’ stiffness coefficient on the structural internal forces of rail beams is discussed.The results reveal that the uniformly distributed elastic support has a beneficial effect on the bending moment’s peak clipping over the supports’ edge,and it is also useful for reducing the mid-span bending moment.The continuous beam model with uniformly distributed elastic support is appropriate for the internal force calculation of rail beam structures.It shows that the change of supports’ stiffness coefficients has a relatively weak effect by using different pile foundations for calculation models,and a proper increase of supports’ stiffness coefficient is good for the structural safety.