This　paper　proposes　a　new　type　of　bolted　assembly　joint　for　connecting　an　H-shaped　steel　beam　to　a　square　HSS　column　and　connecting　HSS　columns　between　each　other　in　a　prefabricated　high-rise　steel　structure.　The　welding　of　components　within　the　same　module　is　completed　in　the　factory,　and　the　modules　are　assembled　with　bolts　on　site.　The　columns　are　connected　via　flanges　and　bolts;　the　H-shaped　steel　beam　and　HSS　column　are　connected　via　cover　plates　that　extend　from　the　flanges,　end-plates　of　the　column　base,　and　beam　end　stiffeners.　Rigid　and　variable　stiffness　beam-to-column　connections　can　be　obtained　by　adjusting　the　number　and　specification　of　the　bolts.　The　stiffness　of　the　variable　stiffness　connection　varies　with　the　load.　Thus,　the　connection　can　be　rigid　in　a　weak　earthquake,　yet　the　cover　plate　and　beam　flange　can　slip　over　each　other　strong　earthquakes,　which　dissipates　energy　by　slipping.　The　hysteretic　performances　of　9　joints　were　analysed　by　finite　element　analysis　(FEA)　and　were　tested　in　the　paper;　seismic　performance　metrics,　such　as　hysteretic　performance,　ductility,　and　rotation　capacity,　were　obtained.　The　bolt　number,　gap　between　the　bolt　shank　and　the　bolt　hole,　thickness　of　the　flange　and　the　cover　plate　that　impact　the　mechanical　performance　of　the　joint　were　analysed,　and　the　slipping　characteristics　of　the　contact　surface　were　obtained.　The　slipping　between　the　cover　plate　and　beam　flange　increases　the　assembly＇s　capacity　of　deformability,　ductility,　energy　dissipation,　and　slipping　energy　dissipation　without　significantly　reducing　its　ultimate　bearing　capacity.