The　effect　of　bifurcation　structure　in　a　road　branched　tunnel　on　ceiling　gas　temperature　needs　to　be　clarified.　However,　the　previous　studies　mainly　focused　on　the　temperature　distribution　in　ordinary　single　tunnel　fires,　it　is　insufficient　in　branched　tunnels.　Therefore,　this　paper　carried　out　a　series　of　reduced　scale　experiments　in　a　branched　tunnel　to　investigate　the　maximum　excess　temperature　beneath　the　tunnel　ceiling.　The　reduced　scale　experiments　with　heat　release　rates　varied　from　1.72　kW　to　6.04　kW　were　conducted　under　natural　ventilation　and　forced　ventilation.　Three　bifurcation　angles　of　5　degrees,　10　degrees,　and　15　degrees　were　conducted.　The　predicted　model　by　dividing　dimensionless　ventilation　velocity　into　two　parts　was　established　on　the　bases　of　theoretical　analysis　and　experiments.　Results　show　that　the　bifurcation　structure　has　a　significant　effect　on　the　flame　plume.　For　a　given　heat　release　rate,　the　maximum　ceiling　temperature　decreases　with　the　increasing　of　ventilation　velocity　because　of　the　more　significant　cooling　effect　compared　with　oxygen　supply　effect.　The　maximum　ceiling　temperature　varies　as　2/5　power　of　the　heat　release　rate　when　the　dimensionless　ventilation　velocity　is　lower　than　0.19.　The　affection　of　bifurcation　angle　on　the　maximum　temperature　could　be　ignored　under　natural　ventilation,　but　this　affection　is　reinforced　under　forced　ventilation.　The　predictions　by　proposed　model　are　compared　with　experiments　and　they　are　in　good　agreement.