Assembly　joints　are　crucial　to　structures,　and　this　paper　proposes　a　cruciform　plate　assembly　joint　suitable　for　large-span　single-layer　grid　shell　structures.　The　joint　consists　of　circular　steel　pipes,　cruciform　steel　plates,　angle　steel,　rectangular　connection　cover　plates,　circular　cover　plates,　and　high-strength　bolts.　Circular　steel　pipes,cover　plates,　and　cruciform　steel　plates　are　welded　in　the　factory,　while　cruciform　plates,　angle　steel,　and　rectangular　cover　plates　are　connected　using　high-strength　bolts　on-site.　By　setting　angle　steel,　rectangular　connection　cover　plates,　and　cruciform　steel　plates　bolt　connections,　when　the　joint　is　subjected　to　bending　loads,　angle　steel　and　rectangular　connection　cover　plates　can　initially　bear　the　bending　loads,　thereby　protecting　the　cruciform　steel　plates　inside　the　joint　from　damage　and　enhancing　the　bending　resistance　of　the　joint.　Utilizing　finite　element　simulation　methods,　a　finite　element　model　of　the　new　connection　joint　was　constructed,　and　the　effect　of　variables　such　as　the　thickness　of　cruciform　plates　and　angle　steel　on　the　bending　resistance　of　the　joint　in-plane　and　out-of-plane　was　analyzed.　Through　parametric　studies　of　the　dimensions　of　each　component,the　influence　of　these　factors　on　the　in-plane　and　out-of-plane　bending　resistance　of　the　new　connection　joint　is　determined.　The　research　results　show　that　the　cruciform　joint　formed　by　connecting　angle　steel　with　rectangular　cover　plates　exhibits　excellent　performance　in　terms　of　bending　stiffness　and　load-bearing　capacity.　By　adjusting　the　thickness　of　the　cruciform　plate,　the　number　of　bolts,　and　the　thickness　of　angle　steel　and　cover　plates,　the　initial　bending　stiffness　and　bending　load-bearing　capacity　of　the　joint　can　be　regulated.　Meanwhile,　based　on　rigid　joint　design　methods,theoretical　design　of　the　semi-rigid　joint　was　conducted,　and　the　results　show　that　this　method　can　ensure　that　the　design　bending　moment　of　the　joint　basically　reaches　the　yield　bending　moment　of　circular　steel　pipes,　fulfilling　the　design　specifications　and　enhancing　joint　safety.　©　2024　Beijing　University　of　Technology.　All　rights　reserved.