The fundamentals of the theory of automatic control of linear sys-tems are outlined. A mathematical description of the operation of control systems and their links is presented. The types of control circuits, the structural implementation of control methods, and methods of connecting the simplest links of an automatic parameter control system are considered. The object-oriented modeling programs VisSim and K D were used.The book is aimed at students of educational programs "Automation and Control", "Power Supply of Enterprises", "Automation of Technological Processes", "Information Systems in Economics". It may be useful for teachers and students of technical specialties at universities in which control theory is a general technical discipline.All rights reserved: No part of this manual may be reproduced in any form without the written permission of the copyright owners.