Abstract: The study of safe and efficient mining of orebodies under complex topographic conditions is of great significance for releasing the productivity of mine resources.In order to solve the problems of large disturbance to the surface and difficult recovery of pillars caused by room-and-pillar mining，the adaptability of Yichang Shaiqi River Phosphate Mine is studied from two aspects of stope structure and mining sequence based on strip filling mining technology，so as to improve ore recovery and reduce surface disturbance.Firstly，according to the characteristics of in-situ stress under alpine valley terrain，the high and low stress mining areas in the pan area are divided，the zoned stope structure is constructed，and the reasonable width of strip pillars is obtained by introducing the ultimate strength theory；secondly，the strip mining sequences of “two-mining-one” in high stress mining areas and “one-mining-one” in low stress mining areas are designed，and the high and low stress mining is optimized by using FLAC3D numerical software.The mining sequence of the interval is studied，and the stress variation characteristics and surface deformation characteristics of the surrounding rock during the mining process are studied.The study results show that:①the mining sequence from the low stress mining area to the high stress mining area is relatively good，which can alleviate the stress non-uniformity in the high and low stress mining area；②during the whole mining and filling process，the surrounding rock of the stope is relatively stable，and the vertical pressure stress on the pillar is less than its extreme limited compressive strength；③the evolution characteristics of surface subsidence curve under alpine valley topography can be described as “U→V→U→W”，and surface subsidence is effectively controlled；④compared with the traditional room-pillar mining method，the designed strip filling method can effectively increase the ore mining efficiency，it can provide technical guidance for the mining of Shaiqi River Phosphate Mine and the deposits under similar alpine valley terrain.

Key words: Underground mining, Alpine valley terrain, Strip filling, Room-and-pillar mining, Stope structure, Mining sequence, Ultimate strength theory