文中首先讨论了系统ｘ（ｔ）＝Ａ０＋∑Ｋｉ＝１ＤｉＦｉ（ｔ）Ｅｉ｛｝ｘ（ｔ）的二次稳定性，给出以Ｈ∞小增益条件表示的该系统是二次稳定的充分必要条件．然后讨论了一类不确定内联系统的二次稳定性和分散反馈镇定问题，给出用“集结”后的子系统的一组Ｈ∞小增益条件表示的不确定内联系统二次稳定和可分散反馈镇定的充分条件．分散控制可通过求一组子系统阶数的Ｒｉｃｃａｔｉ不等式得到． In this paper, the quadratic stability of the system x (t) = A0 + ΣKi = 1DiFi (t) Ei {} x (t) is discussed first and the necessary and sufficient condition for the system to be quadratic stable condition. Then, the quadratic stability and the decentralized feedback stabilization for a class of uncertain interconnected systems are discussed. The quadratic stability of the uncertain interconnected system and its implication under a set of H∞ small gain conditions of the “assembled” subsystem are given. Sufficient conditions for decentralized feedback stabilization. Decentralized control can be obtained by finding the Riccati inequality of a set of subsystem orders.