Temperature　rise　induced　by　tunnel　fire　is　a　key　factor　injuring　persons　and　destroying　the　tunnel　lining　structure　as　well　as　the　facilities.　In　order　to　better　comprehend　the　temperature　distribution　induced　by　fire　in　branched　tunnel,　a　series　of　reduced　scale　experiments　with　different　longitudinal　ventilation　velocity　and　bifurcation　angles　were　conducted　to　investigate　the　temperature　longitudinal　decay　in　mainline　tunnel　and　ramp　in　this　paper.　The　heat　release　rate　varied　from　1.72　kW　to　6.04　kW　corresponding　to　3.07　MW-10.8　MW　in　full　scale.　Three　bifurcation　angles　of　5　degrees,　10　degrees,　and　15　degrees　were　considered　to　investigate　the　effect　of　bifurcation　angle　on　temperature　longitudinal　distribution　in　branched　tunnel.　Results　show　that　the　bifurcation　angle　influences　temperature　distribution　between　fire　source　two　sides　due　to　the　asymmetric　air　entrainment.　The　increasing　of　heat　release　rate　results　in　the　higher　temperature　under　natural　ventilation.　The　ventilation　velocity　had　a　greater　enhancing　effect　on　the　temperature　rise　in　mainline　tunnel　due　to　smoke　accumulation　effect　at　downstream　of　fire　source.　The　exponential　correlation　is　proposed　to　predict　the　longitudinal　temperature　beneath　the　tunnel　ceiling　not　only　in　mainline　tunnel　but　also　in　ramp　by　taking　the　bifurcation　angle　into　consideration.