Abstract: The deformation and failure of tunnel surrounding rocks are closely related to various factors, including the rock strength, the spatial combination relationship of the structural planes, the groundwater and geostress etc. In order to study the influence of the spatial combination relationship of structural planes on the stability of tunnel surrounding rocks, this paper is based on the geological conditions of the Xiangjiawan tunnel on Zhengzhou-Chongqing High-speed Railway, and uses the UDEC discrete element software to numerically simulate the stability of the surrounding rock under full face excavation, with the focus on the influence of the spatial combination relationship of two groups of structural planes on the shear slip of the structural planes as well as the plastic failure and displacement of the surrounding rocks. According to the deformation differences of the surrounding rocks after excavation(intact, falling and collapse), the paper conducts qualitative statistics to obtain a statistical table of the influence of the spatial combination of structural planes on the stability of tunnel excavation and proposes corresponding con? struction suggestions. The study shows that the deformation failure of the tunnel surrounding rocks mainly occurs in the spatial combination of condition where the distance between structural planes is less than 1.5 m, the dip angle of J1 is 45°~75° and J2 103°~133°.