An　alternate　means　for　protecting　high-rise　stairwell　enclosures　using　the　positive　pressure　ventilation　is　evaluated.　An　analysis　performed　by　using　the　Fire　Dynamics　Simulator　(FDS)　model　shows　that　the　positive　pressure　ventilation　can　be　an　effective　method　for　protecting　the　stairwell　enclosure.　Three　types　of　ventilation　methods　are　compared　in　the　same　fire　condition　and　the　best　one　is　determined　based　on　the　decrease　of　temperature　in　the　stairwell.　The　optimal　rate　for　ventilating　the　stair　requires　optimization　of　the　airflow　rate　according　to　postulated　fire　scenarios　for　the　building　and　the　desired　performance　with　respect　to　tenability　conditions　within　the　stair.