This course is a professional platform course of the School of Mechanical Engineering and Automation of Northeastern University. It is a national first-class undergraduate course and a national boutique online open course. The course mainly describes the basic principles of control theory and its application in mechanical engineering automatic control systems. The emphasis is on chapters 1-8, which are the classical control theory. The course will mainly introduce the basic concepts of automatic control, the establishment of the mathematical model of the control system in the time domain and the frequency domain; analyze the stability and steady-state error of the single-input single-output, linear, time-invariant system; explain the time-domain analysis of the linear control system Method, frequency domain analysis method, root locus method and design correction method. Each chapter has engineering case analysis. Chapters 9-11 are self-study parts, which mainly include the basic theory of discrete control system, modern control theory and intelligent control theory. This course is also suitable for electives for students majoring in metallurgy, chemical engineering, material forming and control.