Design a variable structure controller by making use of exponential adience law. The application of exponential adience law is not only make sure that the system can satisfy approach condition forever, but also make sure that the system can exist sliding mode. 利用指数趋近律,设计了一种滑模变结构控制器,趋近律的引入,不但保证了永远满足到达条件,而且保证了滑动模态的存在。