An　aluminium　alloy　gusset　joint　with　a　7　degrees　arch　is　designed　and　fabricated,　and　a　cyclic　loading　test　is　carried　out　to　address　the　research　gap　regarding　the　hysteretic　performance　of　arched　aluminium　alloy　gusset　joints.　The　mechanical　behaviour　and　the　failure　mode　of　the　joint　under　a　cyclic　load　are　obtained,　and　the　failure　mechanism　is　explained.　The　hysteresis,　skeleton,　and　stiffness　degradation　curves　are　plotted　and　discussed,　the　ductility　coefficient　is　calculated,　and　the　stress-strain　behaviour　is　analysed　in　detail.　The　experimental　results　show　that　the　member　webs　in　the　joint　zone　exhibit　local　buckling　under　a　cyclic　load.　The　row　of　bolts　on　the　upper　flange　closest　to　the　edge　of　the　node　plate　is　torn　when　the　joint　is　loaded　upward.　A　1/4　symmetry　model　is　established　using　the　ABAQUS　finite　element　(FE)　software.　The　effectiveness　of　the　FE　simulation　method　and　the　validity　of　the　model　are　verified　by　experiments.　Furthermore,　a　0　degrees　and　5　degrees　aluminium　alloy　gusset　joint　models　are　established　to　investigate　the　properties　of　the　aluminium　alloy　gusset　joint　with　different　arched　angles.　It　is　shown　that　the　0　degrees　joint　has　lower　ultimate　bearing　capacity　and　higher　energy　dissipation　capacity　and　ductility　than　5　degrees　and　7　degrees　joints.　In　addition,　the　failure　modes　of　three　joints　have　been　studied,　providing　a　reference　for　the　seismic　design　of　aluminium　alloy　structures.