Abstract: In order to further improve the recovery rate of coal resources in Fengfeng Group, extend the service life of the mine, by strengthening technology management, applying gob-side entry retaining, filling mining and a variety of advanced mining technology, and optimizing the design, the liberation resources of "three unders" (under buildings, water and railway), recycling of residual coal, maximumly reducing the loss of coal pillar in mining area can effectively improve the recovery rate of coal resources and economic benefits and significantly extend the mine life.