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In this study, It is need a phased approach which divided three steps to estimate a appropriate time for evacuating when the fire is occurred in a theater at the Multiplex cinema. First of all, the present status data of the Multiplex Cinema in Korea is collected by statistics to perceive the conditions of the building type. The geometry data and the basic condition on a fire simulation are analyzed. In addition, the simulation research is conducted to predict critical items such as a height of the smoke, fluctuations of the indoor air temperature and optical density, when the fire is ignited a certain position in the theater. Finally, a required evacuation time for total occupants in the building is estimated by SIMULEX to evaluate the location and size of the exit and the distances for evacuation. As the results, the target building could satisfy the several limitations for the occupant's evacuation.