With the improvement of networking and information technology in industrial automation products,the risks of network security are also increasing.As the central nervous system of nuclear power plants,nuclear power DCS,if attacked,will directly affect the production and economic interests of nuclear power enterprises,and even threaten national security if it is attacked by networks.This paper clarifies the standards and goals of nuclear power DCS network security based on mandatory network security requirements and regulations,specific network security requirements in the nuclear power field.