Based　on　quasi-static　tests,　a　pseudo-dynamic　test　of　two　1/8-scaled　concrete-filled　steel　tubular　(CFST)　lattice　columns　with　flat　lacing　tubes　was　performed.　The　seismic　records　from　the　Wenchuan　2008　Earthquake　and　Kobe　1995　Earthquake　were　used　as　input　ground　motions.　Seismic　performance　including　deformation,　strength,　stiffness,　and　energy　dissipation　of　the　CFST　lattice　columns　was　studied　with　earthquakes　and　main　aftershocks　of　different　intensities.　The　results　show　that　the　CFST　lattice　columns　with　flat　lacing　tubes　had　good　seismic　performance.　The　structure　was　in　an　elastic　state　when　subjected　to　the　intensity　8　frequent,　basic,　rare,　and　extremely　rare　earthquakes.　Under　the　intensity　9　rare　earthquakes,　the　CFST　column　limbs　yielded,　and　the　structure　entered　the　elastoplastic　working　state.　With　the　increase　in　the　peak　ground　acceleration,　the　strain　of　the　steel　tube　at　the　bottom　and　the　maximum　response　displacement　at　the　top　were　both　significantly　increased.　The　plastic　hinge　region　at　the　bottom　of　the　CFST　limb　did　not　form　a　yield　ring　until　the　end　of　the　test,　and　there　was　no　apparent　structural　damage.　The　main　aftershock　aggravated　the　cumulative　damage　of　the　structure,　and　the　structural　stiffness　degradation　phenomenon　was　obvious.　After　experiencing　one　main　shock　(intensity　9　rare)　and　two　equal-strength　aftershocks,　the　elastic　stiffness　of　the　structure　was　reduced　by　about　50%　compared　with　the　initial　elastic　stiffness,　while　the　maximum　response　displacement　increased　by　41%.　Through　the　calculation　of　the　strength　and　deformation　of　CFST　lattice　columns　under　various　seismic　conditions,　it　is　further　shown　that　this　type　of　structure　has　sufficient　strength　reserves　and　good　deformability　and　can　still　maintain　a　certain　bearing　capacity　after　many　strong　earthquakes.　CFST　lattice　columns　have　a　great　application　prospect　in　bridge　engineering　in　high-intensity　areas　in　China.　©　2019,　Engineering　Mechanics　Press.　All　right　reserved.