China attaches great importance to the development of marine remote sensing and monitoring technology. The ocean remote sensing systems with complementary vantages offer significant economic and social benefits. HY-1A/B data have been widely used in sea surface temperature forecasting, sea ice operational monitoring in winter, red tide and green tide monitoring in summer, dynamic monitoring of coastal zones, coastal water quality monitoring, and fishery remote sensing. The HY-2A satellite fills the gaps of ocean dynamic environment satellite remote sensing and is the world's only in-orbit comprehensive ocean dynamic environment satellite that carries active and passive microwave remote sensors. HY-2A can simultaneously obtain data on sea-surface wind field, significant wave height, sea surface height, and sea surface temperature. The effectiveness of ocean environment monitoring and catastrophic sea condition forecasting has been improved with the use of satellite data. Ocean satellites provide reliable remote sensing data to the national economy and defense construction, marine scientific research, and global change research. They also play an important role in the international Earth observation system and are highly recognized by domestic and foreign users.HY-1 and HY-2 series satellites lay a solid foundation for the establishment of a sound ocean environment stereo monitoring system in China. With national development and the implementation of "the Belt and Road" strategy in China, the construction of maritime power, the safeguarding of marine rights and interests, and the development of marine economy demand high requirements and emphasize the urgent need for ocean remote sensing. Therefore, the "Long-term Development Plan of Civil Space Infrastructure(20152025)" is focused on the national maritime power strategy and establishes the plan for the ocean satellite series. This development plan is aimed at supporting the areas of marine resource survey, environment protection, disaster prevention and reduction, rights and interests safeguarding, management of sea areas, island and coastal zone investigation, and the polar ocean expedition of China. Moreover, the requirements of land and atmosphere observations are taken into account. On the basis of the development experience and application achievement of HY-1A/B, HY-2A, GF-3, and CFOSAT, multiple optical and microwave remote sensing techniques are developed, a new generation of ocean color and ocean dynamic environment satellites is built for marine networking observation, and ocean monitoring satellites are improved to construct an integrated marine satellite monitoring system. Ocean remote sensing satellites will inevitably play an import role in the process of building maritime power through the construction of space infrastructure.