The　insufficiency　of　seismic　performance　data　and　the　lack　of　seismic　design　provisions　have　affected　the　application　and　promotion　of　the　CFST　battened　built-up　column　(CFST-BBC)　pier　in　high-intensity　areas.　To　understand　the　failure　mechanism,　the　energy　dissipation　capacity,　and　the　hysteretic　behavior　of　the　CFST-BBC　pier,　a　total　of　seven　test　specimens　subjected　to　lateral　cyclic　repeated　loading　were　first　tested.　Meanwhile,　a　fiber-based　finite　element　model　(FFEM)　was　established　by　using　OpenSees　to　simulate　the　seismic　behavior　of　the　CFST-BBC　pier,　and　an　extended　parametric　analysis　was　performed　to　clarify　the　impact　of　key　parameters　such　as　material　strength,　axial　compression　ratio　and　slenderness　ratio　on　the　seismic　performance　of　the　CFST-BBC　pier.　Finally,　theoretical　calculation　methods　for　the　lateral　stiffness,　lateral　resisting　strength　and　allowable　deformation　of　the　CFST-BBC　pier　were　proposed　and　verified　by　comparing　with　experimental　and　analytical　results.　It　is　proved　that　the　calculation　results　obtained　by　the　proposed　methods　can　effectively　reflect　the　intrinsic　characteristics　of　the　seismic　performance　of　the　CFST-BBC　pier　and　meet　the　accuracy　requirements　of　practical　engineering　applications.