In view of the problems of many surface structures, roads and rivers pressing coal, serious waste of resources, surface collapse and destruction of ecological environment caused by mining in Xinyi Mine, the overburden separation grouting filling subsidence reduction mining technology was put forward, the principle of this technology and the key technical links in the construction process was analyzed and studied. Field engineering practice was carried out and application results showed that this technology effectively solved the problem of surface subsidence caused by mining and mining, and released the mining area of raw coal, which had great economic and social benefits.