The　vehicle-induced　responses　of　eight　concrete-filled　steel　tubular　(CFST)　arch　bridges　are　measured.　The　finite　element　models　considering　the　interaction　between　a　vehicle　and　a　bridge　are　established.　The　precision　of　CFST　arch　bridge　models　and　vehicle-bridge　vibration　analyses　is　verified　by　comparing　with　the　measured　acceleration　responses.　The　comparative　analysis　of　accelerations,　velocities　and　impact　factors　in　a　CFST　arch　rib　and　a　suspended　deck　is　carried　out　using　the　finite　element　models.　The　results　indicate　that,　although　the　impact　factors　of　some　CFST　bridges　are　great,　the　impact　factor　may　not　be　used　as　the　riding　comfort　judgment,　and　the　acceleration　or　velocity　should　be　used　to　evaluate　the　vehicle-induced　vibration　performance.　An　approximate　formula　predicting　the　vehicle-induced　vibration　responses　of　half-through　and　through　CFST　arch　bridges　under　different　road　roughness　is　presented,　and　the　feasibility　of　this　formula　is　confirmed　by　the　analysis　of　real　bridges.