In order to improve the recovery rate of coal resources, extend the service life of mine, in view of the "three-under" mining filling, double pump in parallel effective pasty fluid filling Fully mechanized technology was studied, systematic set was formed and applied in Fengfeng mining area. The result showed the technology was with good reliability, low cost, high efficiency, which effectively solved the difficult problem of paste filling mining, implemented the safety and efficiency of paste filling mining, achieved good economic and social benefits.