Membership function is a mathematical tool used for characterization of fuzzy set. In fuzzy diagnosis method, it accurately judges the causes of abnormal knocking in car driving by using membership function. In the study, combined with the experience of diagnosis of abnormal knocking, according to the characteristics of different abnormal knocking, the paper builds a comprehensive set of membership function diagram for improving the efficiency of abnormal knocking fault diagnosis.% 隶属函数是用于表征模糊合集的数学工具，在模糊诊断方法中利用隶属函数的隶属度能较为准确的判断汽车行驶异响故障现象的发生原因。在研究过程中结合汽车异响诊断的经验，针对不同异响点的自身特点，构建起一套较为完善的隶属函数关系图集，提高行驶异响故障现象的诊断效率。
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