The rapid development of industrial control system in thermal power plants also brings security risks such as trojan

virus and network attack. Based on the perspective of the functions realized by industrial control systems of thermal power plants

this paper analyzes the network security risks the systems are exposed to in terms of system structure and maintenance management

and summarizes the research progress in the related network security systems

standards and main protection technologies of industrial control systems both domestic and abroad. Finally

the paper presents that the concept of network security protection is incorporated into the entire life cycle

and comprehensive protection measures are taken in terms of building a robust network framework

adopting active defense technology and establishing an efficient management system.