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The purpose of this study is to identify the relations between the venting and combustibles which are typical three materials, such as the wood, plastic, sofa, and to check the way how to use it in the determination of origin. We carry out two kinds of experiments, which is the effects of venting in the fire growth of combustibles, and which is the fire patterns of materials, such as Char Blister and melted Plastic etc, in the confining structures. The results of this study are as follows. The intensity and weakness of combustion varies widely with the initial conditions of fire, such as the entrance of air etc, and the property of flammable materials. Thereby, referenced with the patterns of fire through the experiments, this literature suggests that the investigator should note the size of venting, the property and arrangements of combustibles, the finishing materials of wall and ceiling, and the temporary and imaginary compartment of the first ignition room, which are divided in the four region for the correct documentation of ignition material and determination of origin.