The　post-fire　bond　behaviour　between　the　steel　tube　and　core　concrete　in　elliptical　concrete　filled　steel　tubes　(ECFST)　is　studied　in　this　paper.　A　total　of　15　post-fire　push-out　test　specimens,　including　9　elliptical,　3　circular　and　3　square　CFSTs,　were　designed　and　tested.　The　testing　parameters　included:　(a)　target　temperatures　(Ttar　=　20　degrees　C,　600　degrees　C　and　800　degrees　C);　(b)　high　temperature　duration　time　(td　=　30　min,　60　min,　180　min　and　300　min);　(c)　length　of　long　axis　of　elliptical　section　(2a　=　200　mm　and　300　mm);　(d)　section　type　(elliptical,　circular　and　square).　The　test　results　indicated　that　the　target　temperature　and　high　temperature　duration　time　affected　the　post-fire　bond　strength　of　ECFSTs　significantly,　and　the　post-fire　bond　strength　of　ECFSTs　could　be　increased　with　the　increasing　values　of　the　two　parameters.　Based　on　the　test　data,　a　two-linear　stage　bond　stress　versus　slip　constitutive　model　considering　the　influence　of　both　the　temperature　and　fire-exposed　surface　area　was　proposed　and　verified　to　capture　the　post-fire　bond　behaviour　in　ECFSTs,　which　could　be　used　in　the　refined　bond　behaviour　numerical　analysis　of　ECFSTs.