Abstract: Combined with the mining practice with roadway paste- like backfill under water body in Gonggeyingzi Coal Mine, the composition and ratio of past- like backfill materials and the backfill technique process were elaborated, the working face arrangement way of roadway paste- like backfill, the drivage backfill sequence a nd support pattern of backill- roadway and the roadway backfill process were studied. In addition, with roadway backfill mining, the paper also analyzed the control effe cts and economic benefits of surface subsidence and underground water gushing. The practice indicated that the surface subsidence were effectively controlled, the su bsidence coefficient was only 3. 5%, the underground water inflow reduced to 150 m3/ h from 350 m3/ h, the coal mine production safety conditions had been greatly im proved and three million tons of coal resources could be liberated.