National parks are regarded as the most important way to protect important ecosystems and biodiversity in China, a big country with huge land and ocean, as well as the core measure to promote “Beautiful China Initiative”. At present, the major challenges of marine national parks in China are insufficient marine investigation and scientific supports, lack of infrastructure and professional staff, and few specifications for marine ecosystem in the current policy guidance. In the future, actions were suggested to focus on three aspects: making up for the shortcomings of scientific and technological support, improving the comprehensive marine protection effectiveness, and building a harmonious marine national park. With the new designation of marine national parks, we hope to fill the protection gap, extend the marine protection scope, increase the experience of building and managing large-scale marine protected areas in off-shore seas. Marine national parks, with high seas protected areas and other effective conservation measures (OECMs), contribute to the goal of “at least 30% of coastal and marine areas will be effectively protected by 2030" in Kunming-Montreal Global Biodiversity Framework. Those will contribute Chinese wisdom and practice to global marine governance and the building of “Maritime Community with a Shared Future”.