In this paper, Xinjiang’s coal field is selected as the investigation area. Through a series of field surveys in Xinjiang, we made the smallscale area analysis of coal field fire using the ground remote sensing technique, and presented the reasonable evaluation of thermal anomaly conditions of Xinjiang’s coal field arising from coal selfignition fires. The results show that the method of smallscale area analysis is available for examining the extinguished actuality of coal fires and detecting fire spots. Therefore, for the selected fireextinguished coal field in Xinjiang, the fire extinguishing effect was effectively analyzed by the means, and the new hidden thermal dangers were sought and diagnosed. For the coal field where the fire has not been extinguished, the utilization of this means approximately identified the severity and range of the fire area, and provided the quantitative and ground references for extinguish engineering.