Abstract: Based on the mining project case of Houguanyin Mountain Iron Mine, the numerical simulations and nonlinear analysis on the stability of typical stope roof and the effects created by goaf on rock mechanical status in orebody are made by using large-scale finite element software MIDAS GTS.Compared with the simulated results of five kinds of typical stope structure mode，the optimal structure parameters of stope is determined according to the excavation efficiency and other factors like mining cost.The practical application in Houguanyin Mountain stope demonstrated that this method was a new way to rapidly optimize stope structure parameters,owning a considerable practical value.

Key words: Numerical analysis, Modeling, Stope structure parameters, Stability