Abstract: Jiama copper mine faces the problems of high altitude,mass flow filling and large filling area,have no codified experience to reference.To determine the best filling system,this paper conducts experiment on the physical and mechanical characteristics of backfill materials,the plan demonstration of backfill system and key technology study of mass and high altitude flow filling.On this basis,the paper determined the gravity filling system of high density unclassified tailings to jiama mine.This plan adopts the technology of deep-cone thickener with tank、backfilling continuous feed solution and backfilling put sand alternately,then the backfill technical problem with high altitude and mass flow has been resolved by the methods.The capacity of filling system enhances to 180m³/h,while the number of backfill system is considerably reduced,cutting down the cost and leads to ease of management.