Through the establishment of linear and nonlinear finite element analysis models conforming to the characteristics of the containment structure of advanced nuclear power plants, a reasonable prestressed tension sequence of the containment is obtained, and the working performance and ultimate bearing capacity of the containment under design accident internal pressure and severe accident internal pressure are calculated. The results are compared with the large-scale structural model test results of 1:10, and a consistent conclusion is reached: advanced Nuclear power plant containment meets the international qualification standard of ultimate bearing capacity ≥2.5 times design internal pressure. The rationality of the conceptual design of containment for advanced nuclear power plant is verified.