提出了改善闭环系统动态响应的方法 ,应用单向环的概念 ,提出了一种计算N值的简易方法 ,尤其对高阶系统 ,优点十分突出 ,从而使奈奎斯特判据判别控制系统稳定性时更加简单、可行 . A method to improve the dynamic response of closed-loop system is put forward. By using the concept of one-way loop, a simple method for calculating N value is proposed. Especially for high-order systems, the advantages of this method are very prominent, which makes the Nyquist criterion discriminant control system stable Sex is more simple and feasible.