Abstract: In order to study the stability of hard-to-mine ore body when using overhand drift mining method, we made analysis and comparison on four different structure parameter of Ⅲ mining area in different mining period by using the software ANSYS. In the end, we obtain the best standard of the drift 5m× 7m and the distance which first mining area exceed the second one, ie. 25m which are similar with the parameter of the cut-and-try stop.