Abstract: To safely and efficiently mining the ore under large cemented filling body，reasonable stope structure is the first issue that need to consider in mining design.On the basis of comprehensive analysis on geological situation and current mining technical condition of some underground mine，stope structure parameters were calculated by using empirical method with theoretical calculation，and four kinds of the preliminary scheme about the stope structure were put forward.Then，the corresponding 3-dimensional numerical model is established，where the deformation，stress distribution of surrounding rock and the plastic zone size were taken as indicators to measure the performance of stope structure parameters.Based on the simulation results，the mechanical response of the various programs in the stope wall rock after room mining are comprehensively analyzed，obtaining the structural parameters under the most favorable mechanical state of the stope.Combining with the theoretical recovery rate of each panel，the programs of stope structure were optimized，that is，when the thickness of top column is at 6 m，the stope span at 38 m and the pillar width at 14 m，stope structural stability keeps in the most favorable state and the stope has a high theoretical recovery rate.The optimized results could provide reference for the follow-up mining design.

Key words: Cemented fill, Stope structural parameter, Numerical optimization, Mechanical response of surrounding rock