This　paper　proposes　a　new　type　of　bolted-assembly　joint　of　an　H-shaped　beam　to　a　square-HSS　column　in　prefabricated　steel　structures.　The　FEMs　were　first　verified　by　experiments　using　three　joints,　and　FEA　was　subsequently　performed　to　obtain　the　seismic　property,　pattern　of　contact　force　and　slipping　rule　on　the　contact　surfaces　of　27　joints　with　various　parameters.　The　parameters　include　the　number　of　bolts,　web　bolt　size,　gap　size　between　the　bolt　shank　and　bolt　hole,　and　flange　thickness.　The　yield　and　failure　mechanism　of　the　joint　were　revealed.　The　analysis　demonstrates　that　the　slip　enabled　improved　bolted　joint　deformation　capacity,　ductility　and　energy　dissipation　capability　without　significantly　decreasing　the　ultimate　bearing　capacity;　the　energy　is　dissipated　through　slipping　on　the　contact　surface　between　the　cover　plate　and　beam　flange,　and　through　plastic　deformation　of　the　beam　and　cover　plate.