Abstract: Granite and its soil are widely dispersed over the southern part of China.There have been more and more granite soil high slopes along with the development of highways.The height of some slopes is more than 80 m.How is the stability of high slopes of the similar soil? Which model and method can be used? How to select the calculation parameters? No final conclusion has been reached on those questions.The engineers mostly rely on the experience in the design of slopes.On the basis of researches on the granite soil high slope,the structural types of granite slopes in south China are studied.The failure types of granite soil slopes are discussed.The mechanical models and the selection of the parameters of slope slide are studied.An analysis of the high slope stability of Shantou-Jieyang Expressway k53+760～k54+022 is given.