Based on the lyapunov approach , my main results are obtained as follows : 1 . the decoupling of the linear time - invariant system and linear time - delay system are discussed . for linear systems with norm - bounded uncertainties , conditions for energy decoupling with input transformation or both state feedback and input transformation are given in terms of linear matrix inequalities 讨论了线性定常系统和时滞系统的能量解耦,研究了具有范数有界不确定参数的线性不确定系统,给出了不确定线性系统仅具有输入变换、同时具有状态反馈和输入变换情况下的能量解耦方法,结果以线性矩阵不等式的形式给出。