The "14th Five-Year Plan" proposes to actively expand the space for the development of the marine economy, coordinate the promotion of marine ecological protection, marine economic development, and maintenance of marine rights and interests, and accelerate the construction of a maritime power. After Mahan’s theory of sea power was established, it has been continuously updated with the development of world politics and economy and transformed into modern sea power. China's road to maintaining sea power is a new development path of sea power that is different from traditional sea power. In the process of safeguarding sea power in China is full of challenges, including the trouble of "three-sea linkage policy", the infringement on China sea power under the veil of "freedom of navigation" from some countries, and the hinderance of non-traditional maritime security to the establishment of a community with a shared future for sea. From a legal perspective, China should resolutely safeguard the maritime rights and interests of its surrounding areas, resolve maritime power conflicts through dialogue, accelerate the maritime legislative process, and actively participate in the international law-making process to achieve the development goals of maintenance of sea power.