In pressurization smoke control system, air supply rates may be calculated under the condition that all the doors are open in order to cope with the worst scenario for the air supply rates. Nevertheless, opening conditions of the doors may have an influence on the pressures of corridor, elevator shaft and vestibule in actual fire. In this study, the effects of opening conditions of the fire-room doors on corridor pressure and required air supply rates are considered, and the existence of a smoke-free situation in corridor even on fully developed fire is found. In addition, the effect on pressure difference between elevator shaft and corridor is examined, when the staircase doors happened to be closed and the pressure of corridor may rise. As a result, the method for design pressure relief between corridor and outdoor is proposed to satisfy the smoke stop condition between elevator shaft and corridor.