To　develop　environmentally　friendly,　highly-efficient　and　resilient　prefabricated　bridge　structure　system,　a　novel　type　of　post-tensioned　segmental　concrete-filled　steel　tubes　(CFST)　bridge　pier　columns　was　proposed.　Key　construction,　load-bearing　state　and　mechanical　behavior　of　the　post-tensioned　segmental　CFST　bridge　pier　columns　were　introduced,　and　detail　design　of　some　key　components　were　established.　A　testing　specimen　was　designed　and　manufactured.　Quasi-static　lateral　cyclic　testing　on　the　post-tensioned　segmental　CFST　bridge　pier　column　was　performed　to　investigate　and　analyze　the　nonlinear　mechanical　behavior,　including　hysteresis　loop,　skeleton　curve,　tension　loss,　energy　dissipation　capacity,　joint　opening,　joint　sliding　and　expansion　of　plastic　hinges.　The　results　show　that　the　post-tensioned　segmental　CFST　bridge　pier　column　can　provide　appropriate　lateral　bearing　capacity　and　satisfactory　self-centering　ability,　and　the　residual　displacement　drift　is　0.2%　when　lateral　bearing　capacity　is　lost.　Tension　loss　is　about　15%　when　the　maximum　lateral　drift　ratio　reaches　5.8%.　Double　plastic　hinge　effect　appears　in　the　post-tensioned　segmental　CFST　bridge　pier　column　and　the　opening　amount　in　bottom　joint　is　notable,　but　the　upper　adjacent　joint　opening　decreases　significantly.　There　is　no　obvious　horizontal　dislocation　or　sliding　between　adjacent　segments　after　the　experiment　and　the　damage　is　not　observed　in　the　segmental　column　while　there　is　a　small　amount　of　concrete　crushing　near　the　bottom　joint　with　stress　concentration,　causing　steel　pipe　into　yield　state.　Poor　energy　dissipation　is　revealed　owing　to　no　additional　energy　dissipater　on　the　specimen,　effective　energy　dissipation　measures　are　recommended　for　post-tensioned　segmental　bridge　piers.　This　research　will　provide　significant　references　for　design　and　performance　optimization　of　post-tensioned　segmental　CFST　bridge　pier　columns.　©　2017,　Editorial　Department　of　China　Journal　of　Highway　and　Transport.　All　right　reserved.