For a class of nonlinear systems with parameter uncertainty based on existent literatures,the problem of robust fault-tolerant control for uncertain linear systems with structured parameter perturbation is to be considered.The conditions for the existence of the desired robust fault-tolerant controllers are provided in this paper.As for time-lag system,the condition for the particular feature(for example disc)is also presented.It is further shown that this condition is equivalent to the solvability of a cer...