Introduction In recent years, automatic control systems have assumed an increasingly important role in the development and advancement of modern civilization and technology Domestically, automatic controls in heating and air conditioning systems. Industrially, automatic control systems are found in numerous applications, such as quality control of manufactured products, machine tool control modern space technology and weapon systems. Even such problems as inventory control social and economic systems control and environment and hydrological systems control may be approached from the theory of automatic control 2022-2-3 72022-2-3 7 1.1 Introduction In recent years, automatic control systems have assumed an increasingly important role in the development and advancement of modern civilization and technology. Domestically, automatic controls in heating and air conditioning systems. Industrially, automatic control systems are found in numerous applications ,such as quality control of manufactured products ,machine tool control ,modern space technology and weapon systems .Even such problems as inventory control ,social and economic systems control ,and environment and hydrological systems control may be approached from the theory of automatic control