Abstract: The mining of a copper mine adopts underhand horizontal cut and fill stoping，the hydraulic sand filling and classified tailings cemented filling technology used in the past have the problems of large water filtration in the stope，poor working environment，low filling body strength and high filling cost. In order to solve these problems，the application research of the full tailings paste filling process was carried out，the process parameters such as the full tailings dense mass concentration，the ratio of cement to sand and the slurry concentration of the filling body were determined，and a highly integrated and automated full tailings paste filling system scheme was designed. The production practice showed that compared with the traditional filling process，the full tailings paste filling has improved the filling operation efficiency and filling strength，effectively guaranteed the safety and stability of the stope，reduced the impact of underground mining on the surface，improved the comprehensive utilization rate of tailings，significantly reduced the filling cost，reduced the external discharge of tailings，extended the service life of tailings pond， and saved the tailings and backwater transportation costs. Also，it eliminates the potential safety hazards caused by the use of graded fine tailings for dam construction，reduces the pollution and safety risks to the surrounding environment，and is conducive to the sustainable development of the mine and the realization of green mining of the mine.

Key words: full tailings paste filling, comprehensive utilization of tailings, green mining