Abstract: Slope stability analysis of different approach parameters was done on Ⅱ grade rock mass of Wangershan branch mine of Jiaojia gold mine by ANSYS. The strain energy of filling body of step approach increases with width of approach increasing. When width of one and two step approach was 5 m, filling body damaged due to could not bear too much stress. It indicates that approach best measurements of Ⅱgrade rock mass of Wangershan branch mine are 4 m×4.5 m (height×width).

Key words: Unstable rock mass, Approach mining method, Mining Parameters