In　this　paper,　models　for　vertical　and　spatial　coupling　vibration　of　vehicle-track-bridge　system　are　established　separately.　The　track　vertical　irregularity　sample　in　time　domain　is　established　by　power　spectrum　density　and　taken　as　the　exciting　source　to　analyze　the　coupling　vibration　of　vehicle-track-bridge　system　of　two　models.　The　advantages　and　disadvantages　and　applicability　of　the　vertical　vibration　model　and　the　spatial　vibration　model　are　analyzed　by　comparing　the　vertical　vibration　responses　of　the　two　models　under　excitation　with　same　level　of　track　vertical　irregularity.　©　(2011)　Trans　Tech　Publications.