研究一类状态变量具有时滞的线性系统的变结构控制问题，指出传统的切换函数在时滞系统中应当是一个切换泛函，给出了在系统谱能控条件下具有稳定滑动模态的切换泛函的设计方法．并利用趋近律设计了相应的变结构控制器．得到了一般时滞系统能够变换为所需要的时滞系统的条件． This paper studies the problem of variable structure control for a class of linear systems with time-varying state variables. It is pointed out that the traditional switched function should be a switched functional in a time-delay system, and a stable sliding mode Switching functional design. The corresponding variable structure controller is designed by using the law of approach. The condition that a general time-delay system can be transformed into a required time-delay system is obtained.