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本文研究了一类由若干个相似子系统和一个外部系统通过对称地内联组成的不确定大系统的二次稳定性问题．用二个低阶子系统以及相应的Ｈ∞范数的术语给出了这样一个系统是二次稳定的充分条件，并且证明了这个条件对于这个系统的过界系统的二次稳定性也是必要的．
In this paper, we study the quadratic stability of a class of uncertain large-scale systems composed of several similar subsystems and an external system by symmetrically inlining. Using the terms of two lower-order subsystems and the corresponding H∞ norm, we show that such a system is a sufficient condition for quadratic stability and prove that this condition is also necessary for the quadratic stability of the system’s over-boundary system .