The parameter of norm a k of normal fuzzy number has been given in which calculates and assesses different class of two step discrimination factor such as intensity, site kind, work situation and structural type.

• 文中给出了计算、评价构成二级评判因素地震烈度、场地类型、工作状态和结构种类各档次正态模糊数范数ak的参数和对实际情况如何确定的方法。