By　analyzing　the　typical　fire　casesand　tunnel　fire　statistics　during　2008　to　2013　in　Fujianprovince　of　China,　results　shows　that　the　main　causesfor　the　fire　were　vehicle　accidents　and　spontaneous　combustion.　By　the　investigation,　there　are　three　approaches　to　prevent　the　tunnel　fire　exposed　to　different　combustibles.　For　flammable　solid,　an　effective　method　to　prevent　fires　is　to　decrease　the　maximum　environment　temperature　and　the　product　concentration.　For　flammable　liquid,　adjusting　the　ambient　temperature　and　enhancing　ventilation　can　prevent　or　reduce　the　fire　accidents.　For　flammable　gas,　the　effective　method　to　prevent　the　fire　is　to　decrease　the　fuel　density　and　the　ambient　temperature.　So,　for　long　tunnels　or　busy　tunnels,　it　must　strengthen　the　management　of　the　vehicles.　Moreover,　in　the　hot　season　and　rush　hour　it　should　control　the　ambient　temperature　inside　the　tunnels.