Abstract: In this paper, based on a full analysis of the research status for the overall design of marine power plants, the problem of the improvement of marine power plant design being limited by a lack of research into multidisciplinary coupling simulation and optimization for marine power plant design is pointed out, research into the multidisciplinary integrated design optimization theory and methodology for marine power plants is proposed, and a framework for a multidisciplinary integrated design system for marine power plants is built. Furthermore, multidisciplinary optimization technology, modern design tool technology, collaborative simulation technology, supporting platform technology, collaborative design software development and other key technologies are studied. A solution method is proposed. The research in this paper can provide a reference for the multidisciplinary integrated optimization design of marine power plants, and it may also help to improve the design quality of marine main power plants.