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Among the fossil fuels, the brown coal is a great deal of resources.However, it is hardly used due to the high moisture content and low calorific value.It has both the week points such as spontaneous combustion and the strong points such as the low-sulfur and low ash content.If we overcome these week points, the using amount of brown coal would be increased.In this study, combustion experiments were done, and the combustion rate determined.Two type brown coals were used as testing samples.As the results, combustion rate of char is increased with increasing oxygen concentration at the same temperature.In the temperature range from 873K to 1073K, combustion rate constant has been obtained for char combustion and the activation energy has been determined from the Arrhenius plot.The activation energy is changed from 2.7 kJ/mol to 21 kJ/mol for the oxygen concentration and the coal types.