Six　welded　hollow　spherical　joint　specimens　were　tested　under　fire　in　fire　test　furnace　to　investigate　their　behavior　under　high　temperature.　The　main　parameters　in　the　tests　were　the　outside　diameter　and　wall　thickness　of　hollow　sphere　and　steel　pipe,　yield　strength　of　steel　material　and　the　load　ratio.　The　distribution　and　influencing　factors　of　the　temperature　fields,　the　displacement　characteristics　and　the　failure　modes　were　obtained.　The　nonlinear　finite　element　numerical　simulation　was　performed　on　the　compression　properties　of　the　welded　hollow　spherical　joints　under　fire　with　the　thermal　parameters　specified　in　the　Eurocode.　The　distribution　law　and　influencing　factors　of　the　temperature　fields　were　analyzed.　By　analyzing　the　displacement　variation　characteristics　of　the　welded　hollow　spherical　joints　under　fire,　their　failure　modes　were　determined.　The　comparison　between　numerical　analysis　and　test　results　show　good　agreement.　It　can　be　concluded　that　decreasing　the　load　ratio　or　increasing　the　thickness　of　the　welded　steel　pipe　can　prolong　the　ultimate　fire-resistant　duration,　and　the　steel　tube　root　is　the　weakness　of　the　welded　hollow　spherical　joint　under　compression　in　fire.