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It is necessary for sound development of performance-based fire safety design method of building to incorporate fire risk aspect into the method. Design fire scenarios and acceptable safety criteria in P-B fire safety design play the role to control fire risk of buildings within an acceptable level. However, the relationship between the fire risk and the design fires in current P-B fire safety design method has not been clarified. In this paper, an attempt was made to develop a methodology for appropriately selecting design fire for evacuation safety designs. Determination of acceptable safety criteria and selection of growth rate coefficient of heat release rate of design fire in evacuation safety designs are considered.