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本文首先讨论了不确定线性系统二次稳定性，得到了该系统是二次稳定的充分必要条件．基于本文得到的结论讨论了不确定线性组合大系统的二次稳定性和联结稳定问题，得到了用关于低阶子系统的一组出模描述大系统稳定性的充分条件．
In this paper, we first discuss the quadratic stability of the uncertain linear system and obtain the necessary and sufficient condition for the system to be quadratic stable. Based on the conclusion obtained in this paper, we discuss the quadratic stability and the stability of the coupled system for uncertain linear systems, and obtain the sufficient conditions for describing the stability of large-scale systems with a set of modules on the lower-order subsystems.