Abstract: The most important point of high-speed rail design and manufacturing is the dynamic response of rocket sled moving under subsonic,transonic,and supersonic conditions.In this paper,a dynamic analysis finite element model is established combining with a sled-rail system of China.The influence of parameters for the rail,track beams,rail fastenings,and liner on the dynamic response of the rocket sled is studied and the principles of valuing structural parameters for the high-speed rail are investigated.Results show that the stiffness of the rail and liner has a greater impact on the dynamic response of the sled-rail system.To obtain a lower dynamic response,the reasonable structural parameters for the high-speed rail are as follows: the elastic modulus of the rail is 210 GPa,concrete strength of the track beam is C20-C60,fastener stiffness is(1 200-2 000) kN/mm,and elastic modulus of the liner is(100-140) GPa.This research can be used as a theoretical basis for designing the high-speed rail.