The　latest　edition　of　national　building　standard　collective　drawings　16G101-2　increased　a　new　type　of　cast-in-place　concrete　sliding　bearing　staircase　with　upper-end　slab,　which　supported　at　the　cantilever　slab.　In　order　to　test　the　seismic　performance　of　this　new　type　of　sliding　bearing　staircase　and　the　reliability　of　its　upper-end　slab　and　lower-end　supporting　cantilever　slab,　a　1/2　scaled　RC　frame　model　with　this　new　type　of　staircase　was　designed,　constructed　and　tested　under　quasi-static　loading.　The　seismic　response　of　the　specimen　at　cracking　state,　yield　state,　peak　load　state　and　failure　state　were　analyzed　to　study　the　failure　mechanism　of　the　sliding　bearing　staircase　structure　and　determine　if　the　bottom　support　will　slide　effectively.　Experimental　results　show　that　sliding　bearing　stair　with　upper-end　slabs　and　lower-end　cantilever　slab　has　good　seismic　performance.　The　boards　of　the　ladder　(including　the　staircase　and　upper-end　slabs)　do　not　resist　lateral　force　and　cracks　do　not　occur　before　the　failure　of　frame　beams　and　columns.　After　loading　into　the　failure　state,　upper-end　slab　and　lower-end　supporting　cantilever　slab　has　no　obvious　damage.　The　design　of　construction　practice　can　satisfy　the　seismic　requirements.　The　sliding　bearing　has　good　seismic　effect.　Horizontal　sliding　occurs　on　the　bottom　board　of　the　ladder　with　vertical　tilt　phenomenon.　©　2018,　Editorial　Office　of　Journal　of　Building　Structures.　All　right　reserved.