It is the development direction to use uncertainty analysis method instead of safety factor method and empirical method for the stope structure parameters optimization design in underground mining. So in this paper presents a method to Optimization of stope structure parameters based on orthogonal finite element-fuzzy reliability-genetic Algorithm. Firstly, establish fuzzy reliability performance function of the stope roof and to obtain its fuzzy failure probability and fuzzy reliability index mathematical expression at different heights and span by orthogonal finite element calculation. Then ...