关键词: 多元统计, 故障诊断, 主元分析

Abstract: This paper summarizes general approaches for fault diagnosis, emphasis is on the applications of multivariate statistical methods for fault diagnosis. General methods are not good at solving nonlinear, time-variant, dynamic, fault isolation and identification problems, different solutions and developments for these problems are reviewed. Furthermore，the future direction of these techniques is indicated．

Key words: multivariate statistic, fault diagnosis, principal component analysis