In　order　to　study　the　fire　resistance　of　concrete-filled　double　steel　tubular　composite　stub　columns(CFDST),　a　refined　numerical　model　of　CFDST　was　established.　Based　on　the　verification　of　test　results　of　similar　components,　the　high-temperature　response　law　and　fire　resistance　influence　factor　of　CFDST　were　analyzed.　The　effects　of　internal　pipe　diameter　thickness　ratio,　external　pipe　diameter　thickness　ratio,　internal　and　external　pipe　diameter　ratio　were　comprehensively　analyzed.　The　fire　resistance　limits　of　CFDST　with　different　section　combinations(inner　circle　and　outer　circle,　inner　square　and　outer　circle,　inner　circle　and　outer　square)were　compared　and　analyzed.　Based　on　the　theory　of　heat　conduction　analysis,　the　temperature　field　distribution　formula　of　CFDST　section　was　deduced,　and　the　formula　was　modified　according　to　the　results　of　finite　element　simulation.　Finally,　based　on　the　principle　of　temperature　equivalence,　the　simplified　calculation　formula　and　bearing　capacity　calculation　method　of　section　temperature　field　of　CFDST　under　fire　were　further　proposed.　The　results　show　that　CFDST　has　good　fire　resistance.　Increasing　the　thickness　of　the　inner　steel　tube　when　the　diameter　is　unchanged　and　increasing　the　diameter　of　the　inner　steel　tube　when　the　thickness　is　unchanged　are　conducive　to　the　improvement　of　the　fire　resistance　limit.　Under　the　condition　of　the　same　load　and　steel　content,　the　fire　resistance　limit　of　CFDST　with　different　section　combinations　is　almost　the　same,　but　on　the　whole,　the　fire　resistance　of　double　circular　steel　tube　concrete　stub　column　is　better.　The　difference　between　the　simplified　calculation　formula　of　temperature　field,　the　bearing　capacity　calculation　method　and　the　finite　element　results　is　less　than　15%.　©　2024,　Editorial　Department　of　Journal　of　Architecture　and　Civil　Engineering.　All　rights　reserved.