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给出系统Ⅱ型聚集条件，在系统与其Ⅱ型聚集的可控性和可观性Ｇｒａｍｉａｎｓ矩阵之积范数之差最小意义下，把系统的Ⅱ型聚集作为其降阶模型。用此方法讨论－１８阶系统的模型降阶问题。
Given the condition of system Ⅱ aggregation, the type Ⅱ aggregation of the system is taken as the reduced order model in the minimum sense of the difference between the controllability of the system and its type Ⅱ aggregate and the product norm of the observable Gramians matrix. This method is used to discuss the model reduction problem of the -18 order system.