Abstract: Fuzzy set FScom proposes three kinds of negative relations on the basis of the traditional fuzzy set. They are contradictory negative relation, opposite negative relation and medium negative relation which are more practical in dealing with the fuzzy information. This paper provides a system of disaster grade evaluation on the basis of the fuzzy set FScom and [λ-]medium negation set, and applies the system to typhoon disaster grade evaluation.

Key words: Fuzzy Sets with contradictory negation, opposite negation and medium negation（FScom）, [λ-]medium negation, fuzzy comprehensive evaluation

摘要： 模糊集FScom在传统模糊集的基础上提出了三种否定关系：矛盾否定关系、对立否定关系以及中介否定关系，对处理模糊知识信息更具有实用性。以模糊集FScom及其[λ]-中介否定集为理论基础，给出了一种基于FScom模糊综合评判方法的灾害等级评判体系，将此体系应用到台风灾害等级评判中。

关键词: 区分矛盾否定、对立否定和中介否定的模糊集（FScom）, [&lambda, ]-中介否定, 模糊综合评判