A case history of design and treatment of an extra-high rock slope is presented in this paper.as example.The preliminary design was carried out based on the geological characteristics and the initial ratio of slope.Optimization and modifications were made subsequently on the basis of dynamic design and informationoriented construction.Qualitative analysis of the failure tendency and the failure range of the slope were carried out according to the regional geological structures

hydrological and seismic conditions.Quantitative analysis was carried out and the slope stability was analyzed using FEM and LEM methods.The design of the drainage system

the design of the anchor-plate retaining system and the countermeasures of many problems in the constructions of the slope were also discussed in this paper.Both the safety evaluation method and the treatment of the slope are valuable to treatment of other similar extra-high rock slopes.