Abstract: The fifth coal seam layering of No.901 mining area of Yuantang coal mine is the lowest slice mining of No.3 coal bed,as the length of 5m of coal pillar in the 4th coal seam layering was exploited and arised the coal fracture zone,caused the signs of coal spontaneous combustion,such as high temperature,high concentration index gas,smell of coal tar and so on,in the side of railway laneway coal pillar of the fifth coal seam layering.On the basis of analyzing spatial distribution of fragmentized coal body,float coal thickness and air leakage,drilled holes to inject water to prevent the fire zone expend,got the fire state by analyzing the index gas,determined the precise position of fire source by using borehole temperature measurement location technology,then injected composite high polymer material to get rid of the fire completely,and guaranteed the safety production of coal mine.