The　new　beam-column　and　concrete-filled　steel　tubular　column-flat　plate　composite　structure　is　characterized　by　the　joint　with　dedicated　connection　device　(hinged　connection)　between　steel　columns　and　concrete　slab.　The　nodes　bear　only　vertical　loads　while　the　horizontal　loads　are　born　by　the　shear　wall　and　beam-column　frame,　and　the　unbalanced　moment　in　the　joint　should　be　very　small　even　naught　to　avoid　the　punching　damage　of　slab　when　an　earthquake　occurs.　The　new　structure　is　different　from　the　general　frame-shear　wall　or　slab-column　structure,　therefore　the　experiment　should　be　implemented　to　study　the　performance　of　the　floor　system.　Through　a　model　test　of　concrete　filled　steel　tubular　(CFST)　column-flat　plate　structure　(inter-cross　with　less　than　3)　with　1/2-scale,　the　mechanical　performance　should　be　studied　under　vertical　uniform　and　horizontal　loads.　Results　show　that　the　bearing　capacity　of　the　floor　system　with　high　security　reserves　is　2　times　higher　than　the　vertical　design　load;　the　relative　displacement　of　the　joint　can　achieve　2.25%　of　storey　height　that　is　two　times　more　of　a　frame　structure＇s　story　drift　limit　in　Code　for　Seismic　Design　of　Building　Structure　before　the　specimens　were　destroyed　even　in　high　ratio　of　shearing　force　from　the　weight　of　superstructure　and　punching　shear　capacity　of　slabs　(gravity　shear　ratio,　GSR＞0.8).　The　seismic　behavior　exceeds　ordinary　flat　floor　slab.