Once　the　shaft　cable　catches　fire,　the　burning　rate　is　generally　about　three　times　that　of　the　horizontal　cable,　and　the　＇chimney　effect＇　will　make　the　fire　burn　fiercely　and　spread　quickly.　Based　on　the　governing　equations　of　electromagnetic　field,　temperature　field　and　fluid　field,　combined　with　the　geometric　model　of　the　actual　cable　shaft,　a　multi-physics　simulation　model　of　the　cable　shaft　is　established　in　this　paper.　Through　the　simulation　analysis　of　the　transient　electromagnetic-fluid-temperature　field,　the　temperature　change　of　the　cable　is　obtained:　in　a　relatively　confined　space,　the　temperature　increases　with　the　height.　By　changing　the　plugging　material　parameters,　the　influence　of　different　plugging　materials　on　the　electromagnetic-fluid-temperature　field　of　cable　under　normal　operation　is　simulated.　It　is　concluded　that　fireproof　material　has　certain　influence　on　heat　dissipation　of　cable　shaft.　The　temperature　of　intermediate　partitions　and　cables　blocked　by　fire-resistant　materials　has　increased　significantly.　The　maximum　temperature　is　0.66°C　higher　than　when　no　fireproof　material　is　used.　©　2022　IEEE.