Through　tensile　testing　of　15　steel　bolt-sphere　joints　and　15　aluminum　alloy　bolt-sphere　joints,　influencing　rules　of　material　type,　high　temperature　and　cooling　mode　on　tensile　properties　of　post-fire　bolt-sphere　joints　were　studied,　and　then　failure　modes　of　the　joints　were　determined.　According　to　experimental　data,　the　calculation　formula　of　residual　tension　capacity　of　post-fire　bolt-sphere　joints　was　presented.　Experimental　data　indicated　that　(1)　decreased　extension　on　the　mechanical　properties　of　aluminum　alloy　bolt-sphere　joints　after　high　temperature　in　the　fire　was　significantly　higher　than　that　of　the　steel　bolt-sphere　joints;　(2)　when　fire　temperature　was　lower　than　800　degrees　C,　the　tension　capacity　of　steel　bolt-sphere　joints　could　be　restored　by　more　than　90%　after　cooling;　(3)　when　fire　temperature　was　lower　than　500　degrees　C,　the　tension　capacity　of　aluminum　alloy　bolt-sphere　joints　could　be　restored　by　more　than　50%　after　cooling;　(4)　bolt-sphere　joints　could　still　satisfy　the　requirement　of　＂strong　node　and　weak　member＂　after　a　fire;　and　(5)　material　type　and　fire　temperature　were　the　main　factors　that　influenced　post-fire　mechanical　properties　of　bolt-sphere　joints.