Abstract: Filling mining method can effectively control the mining subsidence but also improve the recovery rate of coal resources.In recent years,it becomes the effective method and development direction of mining coal resources under buildings,water bodies and roads.Based on the application practice of the technology of mining with paste-like filling under water in Gonggeyingzi coal mine,the composition and proportion of filling materials,the filling system and process were studied.And the technical effects and economic benefits of filling mining under water was analyzed.The practice indicates that,the filling effect performs well,the filling rate is above 90%,and the underground water inflow reduces to be 150m³/h from 350m³/h.The coal mine production safety conditions have been greatly improved and 3 million tons of coal resources can be liberated.