Abstract: In order to deal with the problems of complex geological conditions and a variety of surrounding rock weak structures and easy to destroy instability and support difficulties during the inclined tunnel in crossing coal seam, we focus on analyzing type of surrounding rock weak structures and its deformation and failure characteristics. Further, we analyze the law of the plastic zone distribution and deformation of different surrounding rock weak structures by using the Numerical simulation software FLAC^3D, and then determine the concrete plans to reinforce supporting in different surrounding rock weak structures. The plans were applied to the engineering practice successfully.