Abstract:According to the engineering geological conditions and the proportions of the sandstone and the slate,the strata in the tunnel area are divided into different parts. The rock mass and the structural planes are classified into different species. The rock near the tunnel is then classified using the T system and the RMR system. The deformation of surrounding rock is calculated and analyzed according to the Hoek-Brown method based on the geological strength index(GSI). By classifying the surrounding rock and calculating the deformation,the tunnel boring machine(TBM) applicability in the west route of South-to-North Water Transfer Project is discussed.