The　train　vibrating　load　simulation　is　the　first　step　for　analyzing　train-induced　environmental　vibration　problems,　at　the　same　time　the　rationality　of　load　simulation　has　also　effects　on　analysis　results　for　environmental　vibration.　Two　numerical　simulation　methods　are　studied　here,　and　some　shortcomings　of　them　are　pointed　out.　In　order　to　improve　models　and　raise　the　speed　of　simulation　of　train　vibrating　load,　two　new　numerical　methods　are　constructed.　Through　adopting　frequency-response　functions　and　railway　track　irregularity　PSD,　methods　and　models　are　optimized.　The　speed　of　simulation　is　enhanced　with　fast　Fourier　transformation.　Finally,　numerical　simulation　examples　show　that　the　new　methods　are　more　reasonable　and　effective　in　comparison　with　the　old　methods.