While open ming was conducted in Huidong Lead Zinc Mine,the rich ore section in southwest slope was extracted with overhand cemented cut and fill mining method.In order to mine the rich ore section effectively and control the disadvantageous effects of this mining on the stability of slope,a three dimensional finite element method was used to analyze the mining process and an orthogonal raneg method was used to study stope structure parameters and the evaluation index of stability in light of the analysis results,so as to put forward reason able parameters of stope structure and the strength requirement of fill mass and defermine the locations to be consolidated.