S1, analyzing a top-level demand of the nuclear power plant based on application scenarios and mission profiles, constructing a demand model, and obtaining a downward output of the demand model based on the demand model;

S2, benchmarking the downward output of the demand model to form a nuclear power plant function mapping, and completing a construction of a function model and an output of data information based on the nuclear power plant function mapping and specific functions to be executed by subsystems, devices and components of the top-level demand of the nuclear power plant;

S3, integrating port information, upstream and downstream elements and the data information to be transferred between the demand model and the function model, and constructing a logical architecture model based on a demand distribution of the demand model, specific conditions of a function decomposition of the function model and a structure of the nuclear power plant;

S4, constructing an evaluating and simulating model of the nuclear power plant based on a design scheme, a working principle of the nuclear power plant, and a parameter configuration, a topological structure connection completed by an evaluation and simulation;

S5, simulating and analyzing operation characteristics of the subsystems, the devices and the components based on the evaluating and simulating model of the nuclear power plant, and constructing a function evaluation model;

S6, constructing an overall performance evaluation model based on the function evaluation model and a simulation demonstration of an overall performance evaluation of the nuclear power plant; and

S7, constructing a data information communication model, realizing an information interaction among the demand model in the S1, the function model in the S2, the logical architecture model in the S3, the evaluating and simulating model of the nuclear power plant in the S4, the function evaluation model in the S5 and the overall performance evaluation model in the S6, and completing the evaluation and simulation of the nuclear power plant based on the model.