Due to the long life cycle, high safety and quality requirements and complex management of nuclear power construction projects, procurement decisions are in great demand for mature project management. Under the background of China's active development of nuclear power, drawing lessons from the internationally accepted project management maturity model, combining the characteristics of nuclear engineering projects and one of the important factors of nuclear power industry safety culture-China Nuclear Power, this paper discusses the project management capability maturity model, and puts forward the basic framework, which provides ways and methods for adapting to the environmental characteristics of nuclear power projects and evaluating and continuously improving their management capabilities.