Abstract: Determination of reasonable stope structure parameter is one of the important measures to control the ground pressure and realize the safe and efficient mining of orebody. The merits and demerits of different stope structure parameters are determined by a number of indicators， but the trend of the indicators are usually not unified. In view of the practical production in Zhangzhuang Iron Mine， and through the numerical simulation of FLAC3D， the energy release rate， the yield rate and the tensile rate of the roof were obtained. And combining with the cemented filling rate， the AHP and the fuzzy comprehensive evaluation method were adopted to obtain the comprehensive evaluation index and to evaluate the merits and demerits of the stope structure parameters. And then the genetic algorithm was used to gain the optimal stope structure parameters， which provides the theoretical basis for selection of unequal-width stope structure parameters. The research results and technical methods can be applied to other large-scale deep metal mine with backfilling.

Key words: Stope span, Numerical simulation, Analytic hierarchy process, Fuzzy comprehensive evaluation, Genetic algorith