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In spite of economical efficiency, high reliability, and an excellent characteristic of generating power, the internal combustion engine has problem of environmental pollution. Because of such reasons, CO, HC, particulate and NO_(x) must be reduced and the technique of combustion analysis is needed. This study aims to compare heat release by the ensemble average of the existing method with a consequence to get by the least squares method for pressure data. This paper propose a heat release computation method that can analyze the most correct , straight and simple combustion phenomenon. In conclusion, we found that the least squares method of third-order fits computational method of heat release very well.