Abstract: The three schemes related to the option of different stope width(12m,13 mand 14m)of Longmenshan mining area L23 orebody has undergone an optimal selection by adopting the Fuzz Comprehensive Evaluation.By establishing the Analytic hierarchy process model of stope structural parameters and its membership matrix,combined with on-site investigation,we can define the technical and economic indicators.The further introduction of FLAC3D numerical simulation can output the six safety indicators such as the maximum principal stress,the shear stress,the roof displacement etc.Based on entropy method,the various index weights and total sort weights can be specified.The final conclusion that the 13 mstope width is the optimal strucutral paramters can be drawn after the multiple-factors(indicators)& multi-targets(schemes)fuzzy comprehensive evaluation.The entropy calculation results demonstrate that doubled-sided displacement is the most important indicator to the comparison of schemes.Therefore,after excavation,safety measures must be taken to doubled-sided after excavation,such as concrete spraying support.This method has a practical value to ensure the mining safety of LongmenShan mining area L23 orebody.