研究了一类相似组合大系统。此类系统的互联项不是对称的且不满足匹配条件。为了设计出系统的分散控制器，本文提出了一种二步法设计方案，充分地利用了系统的互联项的有利作用。首先，设计出系统的假想的互联项──满足匹配条件，并利用它把系统改变成新的形式。然后，基于系统的新形式，采用常规的设计方法，设计出系统的分散控制器。此控制器确保系统二次稳定。 A class of similar composite system is studied. The interconnected items of such systems are not symmetrical and do not satisfy the matching conditions. In order to design decentralized controller of the system, a two-step design scheme is proposed in this paper, which makes full use of the beneficial effect of interconnected system. First, we design a hypothetical interconnected system of the system - meeting the matching conditions and using it to change the system to a new form. Then, based on the new form of the system, the decentralized controller of the system is designed by using the conventional design method. This controller ensures that the system is secondarily stable.