Abstract: The stability of underground rock masses engineering is mostly controlled by field stress and the distribution of structural plane.The detailed studies carried out in this paper based on numerical method and deformation monitoring of actual engineering show: ① The stability of underground openings containing a fault is worse when the side stress coefficient is gradually increasing;② The controlled effect on stability of underground openings containing a fault is obviously different under different stress state;③ More deformation or instable zone of underground openings can happen when the fault close-by and non-intersect excavating surface and horizontal tectonic stress field is larger.These results would offer a guideline in evaluation of large underground openings.