This　research　aims　to　establish　a　series　of　small-scale　experiments　to　analyze　the　effect　of　ramp　slopes　on　the　temperature　distribution　of　Liquefied　Petroleum　Gas　(LPG)　fire　in　a　model　branched　tunnel　under　longitudinal　ventilation.　The　heat　release　rate　under　experimental　conditions　reached　2.57　kW　to　7.70　kW　and　five　ramp　slopes　of　0　%,　3　%,　5　%,　7　%　and　9　%　were　conducted.　For　a　specific　given　bifurcation　angle,　the　maximum　exceedance　temperature　of　the　fire　in　the　expanding　region　before　the　bifurcation　angle　is　measured　and　ana-　lysed.　Results　show　that　the　maximum　exceedance　temperature　in　the　main　tunnel　increases　as　the　ramp　slope　decreases,　which　is　mainly　because　the　stack　effect　enhances　the　entrainment　of　the　air　and　accelerates　the　smoke　flow.　Furthermore,　the　modified　model　of　the　maximum　exceedance　temperature,　which　could　consider　the　influence　of　ramp　slope　for　a　branch　tunnel　fire　is　established　according　to　the　experimental　results.　The　pre-　dicted　results　agree　well　with　those　of　the　experimental　study　for　the　main　tunnel.　The　results　could　provide　a　reference　and　contribute　to　the　knowledge　of　smoke　extraction　strategies　designed　for　branched　tunnels.