Abstract: A coupled dynamic model of train-longitudinally connected ballastless track on earth subgrade was established. In the model, the track and subgrade were regarded as a layered viscoelastic body, which was modeled on continuum theory, and discretized with Galerkin method. The model was used to analyze the dynamics of ballastless track on earth subgrade of the Beijing-Tianjin high-speed railway as the CRH2-300 EMUs running at speeds of 300 and 350 km/h. The calculated results were compared with measured data, which verified reliability of the proposed model. The results show that the maximum stresses in CA（cement asphalt） mortar are 46.8—50.5 kPa, much less than the design specification of 15 MPa; dynamic deformations of subgrade decrease slowly with depth, while dynamic stresses decrease rapidly; dynamic stresses produced by a single bogie distribute about 5.00 and 3.25 m longitudinally and laterally, respectively; and the distribution of dynamic deformations in slab, CA mortar layer and supporting layer have a little difference along the depth direction.