A vertical vibration dynamic model including a discrete elastic supported beam under moving loads with its foundation elasticity stiffness abrupt change is established.Aiming at speed-raised railway,dynamic finite element method is adopted in the paper in order to analyze the dynamic responsing regularity of the track structure under the condition of the original irregularities and different velocity of locomotive passing though the track with rigidity abrupt change.The computations show that the track irregularities and rigidity abrupt change caused by failure of fastener and sleepers have notable influence on response to the track structure.