Abstract: Based on 71# ore-body in 940~965 m level in Shifengshan Copper Mine，the sub-level stoping method with sill pillars was adopted for the gently inclined to inclined and medium thick ore-body through the related analysis and feasibility demonstration. The sub-level mining of difficult-to-mine ore-body was carried out under the premise of the sill pillars structure remaining unchanged. The stope structure parameters were optimized according to the mining conditions and the occurrence of the ore-body. The test research results indicated that the ore dilution was decreased，the stope production capacity was increased，the processing grade was improved，the mining operation cost was reduced，and so that the mine resources were made full use of.

Key words: Refractory ore-body, Sub-level mining, Stope structure, Copper mine