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It is conductive to discover the fire or smoke leakage in the monitor region that detecting the smoke area clearly. Firstly, an adaptive LOG algorithm of smoke detection based on energy difference is proposed by the paper. After detecting the enhancement smoke area by energy difference between frames, dynamic accumulation, filtering and extracting smoke leakage position will be performed. The experiment shows, the method proposed by the paper can detect smoke in infrared video perfectly, and avoid the influence that the thermal infrared imager can't detect the leaking location of smoke sensitively because of the radiation of high-temperature field surrounding by.