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This paper describes an improved fire detection algorithm based on the continuous phase change of the 3.9 μm and 11.2 μm measurements by satellite Himawari-8. According to the results on the brightness temperature change of different latitude under clear sky conditions in one day，it is concluded that the brightness temperature change is stable and obvious. When the fire happens, the brightness temperature of 3.9 μm channel changes rapider than 11.2 μm channel between two continuous ten minutes. An improved fire detection algorithm is proposed based on this change studies, and considers the visible spectra effect on the 3.9 μm channel during the day time. Experiments with this algorithm have been carried out in several places, such as the serious explosive fire near a chemical plant in Qiaodong District, Zhangjiakou City, Hebei Province, at 16:40 (UTC) on November 27, 2018 and a fire incident in southwestern Australia on February 28, 2019， and the improved fire detection algorithm was used to quickly and effectively extract the fire points. The results show that the algorithm can perform fire detection well, and can solve the fire detection on snow, during twilight, sunglint and so on.