The　elastic　seismic　response　characteristics　of　a　rigid　frame　continuous　CFST　truss　girder　bridge　with　composite　piers　are　studied　with　Finite　Element　(FE)　method　based　on　the　commercial　software　MIDAS/civil.　The　FE　results　show　that　the　fundamental　respond　mode　of　the　bridge　is　a　longitudinal　mode　with　a　frequency　of　0.268　Hz,　indicating　the　bridge　is　flexible　enough　to　resist　seismic　activation　due　to　its　light　self-weight　The　critical　regions　are　in　the　elastic　range　under　the　most　unfavorable　direction　of　ground　motion,　and　the　resistance　requirement　in　moderate　ground　motion　is　satisfied.　The　longitudinal　and　lateral　displacements　on　top　of　the　piers　are　examined,　and　it　is　found　that　the　displacement　limit　for　the　CFST　pier　needs　further　discussion.