Abstract: The Marine policy is an important part of the marine strategy, which is the important direction of the development of the country's overall strategy. Because of its special nature, the marginal sea has important theoretical and practical significance to the construction of the national marine strategy and the sustainable development of marine economy. The evolution and development of China's marginal sea policy can be divided into three stages, namely, the exploration of the initial stage of 1949-1978, the transformation of the 1978-1996 years, the stable development stage in 1996. In the development process in accordance with the order of coastal defense, coastal defense, offshore operations, in order to safeguard the national security and economic development as the main line, follow the marine safety mainly, go ahead of the rest of the marine economy, marine safety and economy coordinated development path, and made great progress in more than 60 years, in the development process has gradually established a modern comprehensive marine security concept and maritime power in the construction of the power savings.