Research conclusions:The results of the calculation and test indicate the ballastmats can improve low-frequency wheel-rail force, vertical displacements of rail and tie, vibration acceleration of rail and tie a little. Moreover, it can improve vertical displacement and vibration acceleration of ballast obviously. Vertical displacement of ballast can be increasedmore than 50% and vibration acceleration can be decreasedmore than 45%. The influence ofballastmats on the dynamic response is independentof train speed and thewavelength andwave depth of track irregularity. The ballast elasticity improvementby the ballastmatswith 30mm thickness is the better than the others. The totaldynamic stiffness ofballast track applying to the ballastmatswith 30 mm thickness is close to that ofballastless track. So the 30 mm- thicknesses ballastmats is helpful for transiting the track stiffness between ballastless track and ballasted track.