Most of the fire risk analyses have been done taking the density, i.e.the average amount per unit floor area, of combustibles into consideration. However, risk caused by a fire is anticipated to depend not only on the combustible density but also on other parameters of combustibles, such as shape of each combustible and distribution pattern, among other things, especially at growth stage of the fire. In this paper, effects of combustible properties on heat release rate(HRR) of a compartment fire were analyzed by a Monte Carlo Simulation Technique. ln generating a combustible field, larger combustibles, such as a bed, were put at normal position based on a survey, while smaller combustibles were randomly scattered around the larger combustibles. Results of analyses showed that the HRR of the combustible which was set to ignite a fire had significant influence on the average HRR of the compartment fire at its growth stage. The shorter the average minimum distance of combustibles, the average HRR of fire increased more as time elapsed. These tendencies were more remarkable when the density of combustible was larger.
