This　paper　puts　forward　a　new　kind　of　joint　called　plate-insert　welded　tubular　joint　that　is　used　in　long-span　prestressed　spatial　structures.　It　is　composed　of　one　inserted　plate,　one　major　member,　and　several　minor　members.　The　plate　is　inserted　through　a　major　member,　and　the　minor　members　intersect　the　major　member.　The　static　performance　of　cooperative　work　between　the　inserted　plate,　major　member,　and　minor　members　are　studied　by　numerical　analysis　using　ABAQUS　and　Ansys,　from　which　the　elastic　ultimate　bearing　capacity　of　the　joint　are　obtained.　The　multigroup　of　geometric　parameters　are　set　to　establish　a　number　of　finite-element　models　for　parametric　analysis　to　obtain　the　effect　rule　of　different　inserted-plate　length　parameters　on　bearing　capacity.　Then　a　new　design　method　of　the　joint　is　put　forward　on　the　basis　of　the　analysis.　From　the　joint　design　example　of　the　second　stage　of　the　Tianjin　Binhai　International　Exhibition,　the　reliability　of　the　method　is　verified　using　a　combination　of　numerical　and　experimental　studies.