As the key component of plant set control system, electrical automatic control system is fundamental to realize the machinery automation and safety management of the power plant. The use of DCS in automation system can effectively improve plant operation efficiency, decrease the workload and achieve lower operation cost. Stability and safety of electrical automation system can ensure the safety operation of machinery set in power plant. Aware of the importance of the safety management, modern thermal power industries have to perfect the management system and maintain the stable running of the automation system through scientific ways.