In　order　to　study　the　seismic　performance　of　cast-in-situ　concrete　slab　stairs　with　upper　and　low-end　slab　sliding　bearings　under　earthquake,the　reliability　of　sliding　bearings　and　the　influence　of　building　surface　on　the　sliding　performance　of　staircase　slabs,a　1:2　scale　reinforced　concrete　frame　staircase　was　designed　and　manufactured　according　to　the　national　building　standard　atlas　(16G101-2),and　its　quasi-static　test　were　carried　out.The　results　of　test　show　that　the　staircase　with　upper　and　low-end　flat　sliding　support　has　better　seismic　performance,and　the　platform　and　staircase　plates　have　not　been　damaged;　the　staircase　with　upper　and　low-end　flat　sliding　support　has　good　sliding　performance,and　the　strength　of　building　surface　is　low,which　can　neglect　the　influence　on　the　sliding　performance　of　staircase;　the　failure　of　staircase　specimens　mainly　concentrates　on　the　loading　process　of　staircase　beams　and　staircases;　There　is　a　vertical　heave　phenomenon　at　the　bottom　of　the　middle　ladder　plate,but　it　is　at　a　small　level.The　sliding　bearing　staircase　separates　the　ladder　plate　from　the　frame,effectively　avoids　the　oblique　bracing　effect　of　the　ladder　plate　components,and　shows　better　seismic　performance.　©　2019,　Editorial　Department　of　Journal　of　SJZU.　All　right　reserved.