Based　on　finite　element　theory,　sled-track　dynamic　model　of　high-speed　slide-rail　of　rocket　seld　system　was　established,　and　dynamic　interactions　of　sled-track　under　different　rail　regularity　conditions　were　calculated.　The　variety　law　of　attitude　of　sled　train　running　on　track　was　obtained.　The　effect　of　track　regularity　on　sled-track　dynamic　interaction　was　analyzed.　The　results　show　that:　the　sled　train　running　on　the　track　can　cause　yaw,　heaving,　pitching　and　rolling　around　its　inertia　centre.　The　average　impact　acceleration　and　average　impact　stress　of　sled　train　increase　approximately　in　a　line　with　the　increase　of　track　deviation.　The　effect　of　track　regularity　on　sled-track　dynamic　interaction　is　very　strong.　The　track　regularity　is　one　of　the　mainly　considered　questions　on　the　design　of　high-speed　track.