A method to evaluate the stability of rock surrounding for tunnel by using the Bayes discriminant analysis(BDA) theory is presented.The factors influencing the stability of rock surrounding for tunnel were taken into account to build a forecast BDA model.Large sets of engineering data in some tunnels were used as the training samples.The resubstitution method was introduced to verify the stability of BDA model and the ratio of mistake-discrimination is lower after the BDA model was trained.A set of data in ...