Sealing　the　tunnel　entrance　is　one　of　tactic　for　railway　tunnel　firefighting.　In　order　to　understand　the　effect　of　tunnel　entrance　sealing　ratio　on　fire　behavior,　Computational　Fluid　Dynamics　(CFD)　is　used　to　simulate　tunnel　fire　with　different　heat　release　rates　and　sealing　ratios　varied　from　0%　to　100%.　Both　the　maximum　temperature　and　the　temperature　distributions　along　the　tunnel　ceiling　were　calculated　by　the　empirical　model　and　compared　with　previous　experimental　data.　Results　show　that　the　ceiling　temperature　increases　with　sealing　ratio　due　to　the　heat　accumulation　inside　the　tunnel　when　the　heat　release　rate　is　relatively　small.　Moreover,　the　longitudinal　ceiling　temperature　decreases　with　the　increase　of　the　tunnel　entrance　sealing　ratio　at　initial　stage　and　then　tends　to　stability　due　to　less　oxygen　supply　when　the　heat　release　rate　is　relatively　large.　The　maximum　temperature　along　the　tunnel　ceiling　decays　exponentially.　The　correlations　determining　the　maximum　temperature　and　temperature　decay　beneath　the　tunnel　ceiling　are　proposed　to　modify　the　current　model　taking　the　tunnel　entrance　sealing　ratio　into　account.　The　predictions　agree　well　with　the　experimental　and　measured　data　by　the　modified　equations　of　this　paper.