Abstract: In order to solve the fire area hidden danger that has long existed in Yuanbaowan Coal Mine No. 4 coal seam 406 room pillar type goaf, and the safety mining problem of the working face of the 6# coal seam under the fire area, based on radon detection method to detect the fire area technology, the ground automatic large flow long-distance transmission grouting station was established. Water, cement, fly ash and MH fire extinguishing materials were selected as the grouting materials, and the comprehensive method of curtain isolation and plugging was adopted to control the 406 fire area, supplemented by grouting in the high-temperature fire area and liquid nitrogen injection. The results show that: after grouting, the drilling temperature in the fire area dropped from the highest 558 ℃ to 40-50 ℃, and continued to drop. The concentration of CO gas in borehole in the fire area decreased from the highest of nearly 1% to about 10×10-6, and remained stable, without the occurrence of C2H4 and C2H2 gas. In this project, the method of curtain grouting is adopted to extinguish the 406 fire area, as well as the purpose of extinguishing the fire area and the working face 6105, 6106 and 6205 of 6# coal seam.