Abstract: The main mining area in Beiminghe iron mine is mining with the method of non-pillar sublevel caving which large structure parameter combined with induced caving.To fully recover the residual ores, there needs to set supernumerary a recovery drift between every two normal stoping drifts. This paper studied and analyzed several problems according to the characteristics of loose body, the shape of residual body in floor and the feature of ore-rock stability, such as the rational location of recovery drifts, mining method and so on.