This　paper　presents　thirteen　square　columns　to　study　the　behavior　of　nano-concrete-filled　steel　tubular　columns　with　end　plates　after　lateral　impact.　The　failure　modes　of　the　square　columns　subjected　to　lateral　impact　damage　or　not　subjected　to　lateral　impact　damage　were　compared.　The　lateral　impact　loading　height,　steel　tubular　thickness,　and　column　height　were　set　as　the　test　parameters　in　these　tests.　The　effects　of　test　parameters　on　the　ultimate　capacity,　initial　stiffness,　and　ductility　of　columns　are　discussed　in　this　paper.　The　bearing　capacity　of　square　columns　is　decreased　because　of　the　lateral　impact　loading　which　can　also　be　concluded　from　the　test　results.　And　with　the　steel　tube　thickness　increasing,　the　bearing　capacity　and　initial　stiffness　of　columns　are　increased　and　ductility　has　no　obvious　change.　However,　with　the　column　height　increasing,　the　bearing　capacity　and　stiffness　of　columns　are　decreased　and　ductility　is　increased.　Furthermore,　the　strain　development　of　the　columns　under　axial　compressive　loading　is　also　discussed　in　the　paper.　The　results　indicated　that　the　corner　of　the　square　column　is　more　easily　damaged　under　compressive　loading.　According　to　the　test　results,　the　calculated　formula　is　proposed　to　predict　the　ultimate　capacity　of　nano-concrete-filled　steel　tubular　columns　with　end　plates　after　lateral　impact.　The　calculated　results　have　a　good　agreement　with　the　test　results.