本文把模糊矩阵法引进土坝事故诊断。在简述模糊矩阵法的基本原理及步骤的基础上,通过土坝事故诊断实例,说明该法对于具有因果关系不太明显、多因多果等复杂情况的工程事故诊断是适用的。在诊断中,考虑了事故征兆并非是简单布尔变量的情况。 In this paper, the fuzzy matrix method is introduced into the earth dam accident diagnosis. Based on the basic principles and steps of the fuzzy matrix method, an example of earth dam accident diagnosis is given, which shows that the method is suitable for the engineering accident diagnosis with complex causality and multiple causes and consequences. In diagnostics, taking into account the signs of the accident is not the case of simple Boolean variables.