A　finite　element　analysis　model　of　variable　cross-sectional　concrete-filled　steel　tubular(CFST)laced　column　with　flat　lacing　tubes　is　built　with　universal　program　of　OpenSEES,　and　the　calculating　results　of　specimen　obtained　by　OpenSEES　agree　well　with　the　quasi-static　test　results.The　seismic　performance　of　four-element　variable　cross-sectional　CFST　laced　columns　with　flat　lacing　tubes　is　researched　with　calculation　parameter　of　column　slope,　including　the　rules　on　energy　dissipation　capacity,　skeleton　curve,　structure　ductility,　and　stiffness　degradation　of　elements,　and　these　calculation　results　are　compared　with　the　research　results　of　uniform　cross-sectional　CFST　laced　columns.　And　the　influence　of　axial　compression　ratio,　column　height　(slenderness　ratio),　vertical　spacing　of　flat　lacing　tubes,　steel　ratio　of　longitudinal　element,　diameter　ratio　of　lacing　tubes　to　longitudinal　tubes,　yield　strength　of　steel,　concrete　strength　and　other　structural　parameters　on　seismic　performance　of　variable　cross-sectional　CFST　laced　columns　with　flat　lacing　tubes　are　investigated.　It＇s　hoped　that　the　results　can　provide　reference　for　the　improvement　of　CFST　calcalation　theory　and　engineering　application　of　variable　cross-sectional　CFST　laced　column　piers.