By using fuzzy random variable theory and fuzzy set theory, the concept and its calculation method of fuzzy random characteristic quantity of safety grade are put forward.
分别运用模糊随机变量理论和模糊集理论而提出了安全等级模糊随机特征量和安全等级模糊特征量的概念及其计算方法。
Both characteristic quantity of safety grade and its variable are the value obtained from the fuzzy sub-set of safety grade on domain, and are not a definite point.
安全等级特征量及安全等级变量，均为安全等级取值论域上的模糊子集，而并非是一个确定的点。
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