首先给出未确知数的定义、运算及性质，在此基础上定义未确知事件的可靠度。
First, we introduce the definition, operations and properties of unascertained number. On the basis, we defined the credible degree of unascertained event.
基于水质系统的未确知性，运用未确知理论将瞬时排污情形下河流水质模型参数定义为未确知数。
Based on the unascertained characteristic of river water quality system, the parameters of water quality model are defined as the unascertained Numbers by using unascertained mathematics theory.
在此基础上，分析了未确知有理数滤波的适用范围，指出其应用于多输入单输出的数据处理情况。
On this basis, the application sphere of unascertained rational number filtering is analyzed and it applied to the data-processing conditions of multi-input and single-output.
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