In light of the theory of orerock blast and the principle of the refraction and reflection of explosion stress wave on the heterogenous interface between orerock and cemented fill,a technique of small charge and short air interval controllblast was introduced so as to solve the technical problem of fillmass unstability which occured when the cemented tailings fill of both sides were damaged by the blast of high level pillar mining,and realized the safe recovery of high level pillars.