Abstract： Owing to the sustainable uplifting of Qinghai—Tibet Plateau since the later geological time，geologic and topographic conditions are getting more complicated in the southwest and northwest of China，such as deeper river downcutting，especially，in the east flank around Qinghai—Tibet Plateau. So stability problems of both natural and excavated slopes are very prominent in these zones，which is one of the most characteristic issues in both academic fields of engineering geology and rock mechanics. Together with the momentous geology event that the Qinghai—Tibet Plateau is uplifting，typical development characteristics of high rock slopes around Qinghai—Tibet Plateau were analyzed and summarized. The issues are covered in high and steep slopes，short history of evolution，high geostress，and complicated deformation and failure processes. They can all be regarded as the results from rapid unloading under the high geostress conditions. According to the issues and a great number of engineering cases，the geodynamical processes of high rock slope development under unloading and 3-stage evolution mode are established，where time and space evolution sequences are considered. Simultaneously，characteristics and stability significance of slope deformation and failure in different evolution stages are also put forward. Finally，in terms of evolution characteristics of slope，it is pointed out that the stability of high rock slope is the problem of deformation stability，as well as the problem of strength stability. Basic principle，theoretical framework and technical measures of stability analysis for slope deformation are established. In view of geohazard control，engineering principle of controlling deformation is presented；and time option and criteria of controlling deformation are also discussed.
