Building a modern marine industrial system is an important content and inevitable requirement for the development of a modern industrial system，and it is also a key task for Shandong to further promote the construction of a strong marine province. Based on the discussion of basic theoretical issues such as the essential connotation，basic characteristics and influencing factors of the modern marine industry system，this paper combines the analysis of the status quo of marine resources and environmental endowments，the construction of marine high-end elements，the competitiveness of marine industries，and the open cooperation of the sea，aims at the problems including coastal marine space，the choice of the main direction of the marine industry，the construction of the power system，and the coordination of the marine industry，it proposes countermeasures and suggestions for the development of a modern marine industry system in Shandong，focusing on the creation of a modern superior marine industry chain supply chain and promoting the high-quality development of the marine economy. That is：optimizing the spatial layout of the marine industry，consolidating efforts to make breakthroughs in key marine industries，consolidating support and leading the power system，promoting the development of industrial linkage and integration，and expanding the development space of the marine industry.