Abstract: The transfinite phenomena of goaf CO concentration appeared during the end of mining and removing supports period in Jiangjiahe Coal Mine ZF1406 fully mechanized working face of Shaanxi Huabin Coal Industry Co., Ltd,. Based on the actual situation of the working face, the comprehensive fire prevention technology was carried out, which including pouring yellow mud composite gel before stopping mining and infusing polymer gel before removing supports. All above measures ensured production safety and move smoothly of ZF1406 working face.