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In order to analyze the characteristics of wheel-rail vibration of the vertical section in a high-speed railway,a vehicle-line dynamics model is established using the dynamics software SIMPACK.Through this model,the paper analyzes the influence of vertical section parameters,including vertical section slope and vertical curve radius,on wheel-rail dynamics interaction and the acting region of wheel-rail vibration.In addition,the characteristics of wheelrail vibration of the vertical section under different velocities are investigated.The results show that the variation of wheel load is not sensitive to the vertical section slope but is greatly affected by the vertical curve radius.It was also observed that the smaller the vertical curve radius is,the more severe the interaction between the wheel and rail becomes.Furthermore,the acting region of wheel-rail vibration expands with the vertical curve radius increasing.On another note,it is necessary to match the slope and vertical curve radius reasonably,on account of the influence of operation speed on the characteristics of wheel-rail vibration.This is especially important at the design stage of vertical sections for lines of different grades.