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　(1200-2000)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.