[Objective] Site classification is the basic work of vegetation restoration in riparian, and is conducive to provide basic theoretical basis for the vegetation restoration of the riparian zone in the mountain area.[Methods] 60 plots totally having 80 m long in the riparian zone of Huaijiu River in Huairou mountain area, Beijing area, were investigated. 5 factors of soil layer thickness, slope material composition, slope, hardening area and slope length were used as the dominant factors of site classification.[Results] ① Sites of Huaijiu River riparian zone were divided into 3 types, 9 groups, 15 subgroups. ② Populus Canadensis, Salix Matsudana, Vitex Negundo heterophylla, Lespedeza were as suitable for local revegetation as dominant species and other suitable ones as subdominant or auxiliary species.[Conclusion] The riparian zone in Beijing mountain area is mainly covered by short slope with thin soil layer, and gravel-exposed obviously and is seriously disturbance. Hence, ecological environment safety construction of riparian slope should be accelerated.