根据国内外有关在役压力容器声发射检测评定标准、文献以及我们多年的检测和评定经验，利用模糊数学中的隶属度概念和多级模糊综合评价理论，在研究多种检测信息对评定结果影响程度的基础上，提出了声发射源严重度的多级模糊综合评定方法，并初步应用于大型球罐声发射检测评定，取得好的效果 According to the domestic and foreign assessment standards and literature on acoustic emission measurements of in-service pressure vessels and our years of experience in testing and assessment, the concept of membership degree in fuzzy mathematics and the theory of multi-level fuzzy comprehensive evaluation are used to study the influence of various detection information on the assessment results Based on the degree of acoustic emission sources proposed a multi-level fuzzy comprehensive assessment of severity, and initially applied to large-scale spherical tank acoustic emission assessment, and achieved good results