Concrete　filled　steel　tube　(CFST)　got　a　good　application　in　actual　project.　In　order　to　further　the　seismic　performance　of　the　CFST,　experiment　was　carried　on　two　1/5　scale　models,　which　included　one　CFST　frame,　one　CFST　truss.　Based　on　the　experimental　study,　load-carrying　capacity,　stiffness,　ductility,　hysteretic　property,　energy　dissipation　and　failure　phenomena　of　each　model　were　analyzed.　The　study　shows　that　the　seismic　performance　of　CFST　truss　has　high　bearing　capacity,　stiffness,　energy　dissipation　capacity　and　good　ductility.