​Automatic control theory is a technical science that studies the common laws of automatic control. Its initial stage of development was based on the principle of automatic regulation based on feedback theory, which was mainly used for industrial control. The development of automatic control theory was further promoted and improved during World War II in order to design and manufacture aircraft and ship autopilots, artillery positioning systems, radar tracking systems, and other military equipment based on feedback principles. After World War II, a complete system of automatic control theory has been formed, which is the classical control theory based on transfer function, which mainly studies the analysis and design problems of linear constant systems with a single input and a single output. Automatic Control Theory is a major compulsory course in Automation and Electrical Engineering. The teaching objectives of the course are usually through the study of some basic control theory, requiring students to master the composition of the feedback control system, the establishment of the mathematical model of the control system and its online calibration, mastering the system of time domain, frequency domain, and complex domain analysis and calibration methods. Train students' application capabilities through the introduction of some practical engineering problems, and lay a good foundation for their future work.