关键词: 分类评估, 二类分类, 多类分类, 二叉树

Abstract: The AUC method which based on ROC analysis is used to appraise two-classifier，cannot directly solve the appraisal of multiple-classifier，How effectively promoting it to the multiple-classifier appraisal is a hot topic in research area.This article first introduced a multi-class AUC appraisal method F-AUC which based on one against rest method.Then according to this foundation a new multi-class appraisal method B-AUC which based on the structure principle of binary tree was proposed.Making experiment in MBNC experiment platform，analyzing and comparing two methods，the results show that the new method not only is feasible，has the good performances in the appraisal effect and the speed effect.

Key words: classified appraisal, two-classifier, multiple-classifier, binary tree