Abstract: 1# ore body of Baishitamu copper mine in Jiashi County Tonghui Mine Co.，Ltd.adopted non pillar continuous mining with sublevel caving stoping method，and there are such problems in mining as surface fall，steel arch lost stability，roof caving of roadway，high dilution rate，poor operating environment.Aiming at the problems existing in the mining process，the underhand drift paste backfill method was adopted to exploit 1# ore body after plan optimization and comparison of technical and economic characteristics.Results show that this mining method commendably solved the safe problems，including poor stability of surrounding rock，instability of steel arch and roof caving of roadways.Stope structural parameters and mining process were optimized with the loss rate decreasing from 17% to 4%~6%，dilution rate reduced from 18% to 5%~7%.While tailings utilization rate increased to 90%~95%.The underhand drift paste backfill mining enhanced the safety of mining.It is of great significance to the production of other similar mines.

Key words: Broken and refractory mine, Paste backfill mining, Plan optimization, Safe mining