中文摘要：

在层次分析（AHP）中，积合成模型是保序的，如果想得到只有积合成模型保序的结论，还必须限定属性个数大于2．

英文摘要：

In AHP, the multiplicative composition model is rank preservation. To ensure that multiplicative composition model is the only rank preservation model obtained, an additional conditions is that the number of attribute must be great than 2.