This　study　simulated　a　series　of　bifurcation　tunnel　fire　scenarios　using　the　numerical　code　to　investigate　the　temperature　profile　of　bifurcation　tunnel　fire　under　natural　ventilation.　The　bifurcation　tunnel　fire　scenarios　considered　three　bifurcation　angles　(30　degrees,　45　degrees,　and　60　degrees)　and　six　heat　release　rates　(HRRs)　(5,　10,　15,　20,　25,　and　30　MW).　According　to　the　simulation　results,　the　temperature　profile　with　various　HRRs　and　bifurcation　angles　was　described.　Furthermore,　the　effects　of　bifurcation　angles　and　HRRs　on　the　maximum　temperature　under　the　bifurcation　tunnel　ceiling　and　the　temperature　decay　along　the　longitudinal　direction　of　the　branch　were　investigated.　According　to　the　theoretical　analysis,　two　prediction　models　were　proposed.　These　models　can　predict　a　bifurcation　tunnel　fire＇s　maximum　temperature　and　longitudinal　temperature　decay　in　the　branch.　The　results　of　this　study　could　be　valuable　for　modelling　a　bifurcation　tunnel　fire　and　benefit　the　fire　engineering　design　of　bifurcation　tunnels.