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The purpose of this study is to grasp the fire load contributed in the initial phase and the fully developed phase of fires and estimate the heat release rates of composite combustibles. In this study, the investigation was conducted covering 6 buildings, 36 sections (total area of 8753.4m2). In addition, a combustion test was applied to desk unit as a composite combustible, and to the single component composing the desk unit. The results showed that the difference in the mass of combustibles per desk unit is the difference of documents and books, the volume and layout of plastic combustibles provide more effect than that given by the volume of wooden combustibles in the fire growth phase.