Abstract: In order to effectively control the fire hazard in the goaf of the small kiln and prevent the leakage of fire and harmful gases from damaging the coal working face of the lower coal, the detection method combining the isotope radon method and the up and down borehole detection method is used to delineate the hidden danger area, and take targeted measures. Governance measures such as surface fissure plugging, ground borehole injection of liquid nitrogen, and underground nitrogen injection.The results show that the combination of isotope radon measurement and borehole detection can effectively delineate the range of hidden dangers in a relatively short time;The treatment measures of fissure plugging and joint nitrogen injection above and below the well reduced the temperature of the overlying goaf and the concentration of harmful gases such as CO to below the standard, eliminating fire hazards and ensuring the safe mining conditions of the 13103 fully mechanized caving face.