Resilience　describes　the　system　capability　of　defense　and　recovery　to　extreme　disasters.　The　transmission　system,　as　an　important　part　of　the　power　system,　may　occur　large-area　power　blackouts　under　extreme　mountain　fire　disasters　which　are　low-probability　but　highly-risk　events.　A　resilience　assessment　framework　considering　the　whole　process　of　disaster　under　extreme　mountain　fire　disasters　is　developed.　Firstly,　the　influence　of　extreme　mountain　fire　disaster　on　transmission　line　failure　rate　is　quantitatively　analyzed,　and　the　mathematical　relationship　between　the　location　of　fire　point　and　the　line　failure　rate　is　established.　Then,　failure　scenarios　are　obtained　by　using　the　system　information　entropy　to　describe　the　possible　failure　scale　that　caused　by　mountain　fire　disasters.　Secondly,　considering　the　geographical　location　of　failure　components,　repair　crews　dispatch　and　repair　time,　the　power　transmission　system　restoration　model,　aiming　at　minimizing　load　reduction　under　mountain　fire　disasters,　is　established.　The　resilience　assessment　method　of　power　transmission　system　considering　the　whole　process　of　disasters　is　proposed.　Finally,　taking　IEEE　RTS-79　bus　system　as　an　example,　the　effectiveness　of　the　proposed　model　and　the　resilience　assessment　method　is　verified.　The　numerical　results　show　that　the　proposed　method　can　effectively　and　comprehensively　measure　the　influence　of　various　factors　on　the　elastic　performance　of　transmission　system.　In　addition,　the　effects　of　three　typical　technical　measurements　on　improving　elasticity　are　quantitatively　analyzed,　which　provides　a　quantifiable　reference　for　the　power　sector　to　formulate　prevention　and　recovery　strategies　for　extreme　wildfires.　©　2024　Editorial　Department　of　Electric　Power　Engineering　Technology.　All　rights　reserved.