Based on actual characteristics of the tailings ,a Fisher discriminant analysis model is established to evaluate the safety grade of tailings .Regarding a non-ferrous tailings in Hunan Province as the case ,44 sets of tailings data are select-ed to conduct discriminant analyses ,among which four of them are testing samples and they don ’t participate in the training process .The results prove that it has the largest absolute correlation between free height and standardized discriminant func-tion ,in other words ,the significant probability of ...