Abstract:A slope stability predicting model based on n -SVR algorithm,which uses only characteristic parameters of slopes,is put forward. To overcome the difficulty in model selection in the algorithm,leave-one-out method is used to design predicting model;and grid-search method is used to search suitable values of parameters of the predicting model. Leave-one-out method can select appropriate model objectively,avoiding the shortcoming of designing model by experience. The search result shows that with these two methods,the appropriate predicting model can be searched. Applying the predicting model to predict safety factors of 11 slopes after learning with other 71 samples;the result is satisfactory. It is more accurate than a modified BP algorithm and classical SVR;and it shows that the proposed model is effective. Moreover,a new method based on n -SVR algorithm is presented to guide slope design. It can acquire slope safety factors of different schemes by characteristic parameters of slopes quickly and accurately,and evaluate the stability of slope,which will facilitate the determining of an economic and safe slope design scheme.