;The physical and mechanical properties of rockmass has been changing during weathering progress.Proper or not of rockmass parameters have a significant effect on the results of stability analysis.So,it is of great importance considering the weathering affect on properties of rockmass.In order to evaluate inlet slope stability of diversion tunnel of Wunonglong hydropower station,classification of weathering and unloading rockmass has been done based on relation between rockmass quality and weathering class....