1. A method for establishing a prediction model based on multidimensional textures of brain nuclear magnetic resonance images, comprising segmenting the images using a region growing method, extracting, edge texture feature parameters of ROIs using Contourlet transform, establishing a database, and establishing the prediction model, the method specifically comprising the following steps: (1) establishing a ROIs database; (2) segmenting the ROIs in the images using the region growing method; (3) processing the images using the Contourlet transform to extract the following variables: entropy, mean gray, correlation, energy, homogeneity, variance, maximum probability, inverse difference moment, cluster tendency, contrast, sum mean, difference mean, sum entropy and difference entropy; (4) establishing a database of image feature parameters using the variables obtained in steps (2) and (3); (5) establishing the prediction model according to the database in step (4), wherein methods for establishing the prediction model comprises Gaussian process, support vector machine, random forests, Lasso regression and semi-supervised support vector machine; and (6) verifying the feature parameters obtained in step (4) using a sample to modify the prediction model so as to obtain an ideal model with correct results.