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Abstract In order to solve spontaneous combustion and high gas content in the connection of support and air return area, 3106 fully mechanized working face of Guandi Mine was taken as example, combined with geological data, the reasonable fire prevention and control plan was given from the leaving coal and air leakage prevention, the combined prevention technology of high-water material voltage-sharing, high drilling grouting, foamed gel and drilling perfusion between supports was given, the technology could reduce the CO content between supports, from 1 200×10-6 to less than 10×10-6, keep the stability of CO content and ensure the safe withdraw of the working face.
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