Abstract: According to the fire control characteristics of coal spontaneous combustion at 3312 full mechanized caving face in Liangbaosi Coal Mine, base on the analysis of fire location, it put forward a technology,the process was that high boreholes were constructed at upper spontaneous combustion area of the goaf in fully mechanized caving face, and the drilling field started from the front of the roadway and support. It used these boreholes to inject fire extinguishing foam and carbon dioxide in large flow, and adopted the plugging technology for the upper and lower end to control spontaneous combustion fire comprehensively. This technology could give full play to the characteristics, which incluled large flow and wide coverage area of fire extinguishing foam, large density and good inerting effect of carbon dioxide. This technology had a good control effect on controlling the coal spontaneous combustion in goaf.