With the purpose of exploring the reasonable stope structural parameters of complex broken inclined thin deposit with sublevel room and pillar mining method in Mengnuo lead-zinc mine. Based on the detailed field investigation, indoor rock mechanics testing, mechanical parameters analysis of macro rockmass, the numerical model was established with 3D finite difference algorithm software, Flac3D. Through numerical computation of different schemes in stope span and pillars distance, the optimal stope parameters and the optimum pillar reserving parameters were determined, the research results has a certain guidance significance for the safe, efficient and economic exploitation in complex broken inclined thin deposit of this mining area. © 2014 ejge.