Automatic control plays an important role in the in the power generation development process.Automatic control system simulation has important significance to ensure production safety
economy and stability.This paper expounds the basic principles and steps of control system simulation.For example with deaerator water level control system
how to build the mathematical model according to internal mechanism and change rule is analysed and the control system is simulated by MATLAB software.Control quality can be predicted according to simulation results of control system after design or reform
which can meet the requirements of control effect.