Based　on　the　utility　temperature　elevation　empirical　formula　in　large　space　fire,　the　nonlinear　finite　element　analysis　of　the　fire　performances　on　a　single　layer　reticulated　dome　is　numerically　simulated　with　the　thermal　parameters　specified　in　the　EUROCODE　3　and　the　stress-strain　relationship　allowing　for　strain-hardening　of　steel.　The　temperature　fields,　displacement　properties　of　the　structure　and　most　unfavorable　position　are　studied　under　local　fire.　Based　on　the　nonlinear　finite　element　analysis,　the　results　show　that　most　of　the　ultimate　fire-resistant　duration　are　less　than　2　h　under　different　local　fires;　the　influence　of　the　fire　height　is　the　biggest　on　the　ultimate　fire-resistant　duration　of　the　structure,　and　the　effect　of　the　fire　location　is　bigger　than　the　area　of　the　fire;　and　the　region　between　the　first　ring　and　the　third　ring　is　the　most　unfavorable　position　of　the　single　layer　reticulated　dome　under　fire.