The "Blue Granary" is of great significance for safeguarding food security, promoting economic development, culturing emerging industries, highlighting national rights, improving the ecological environment, and breaking through industrial bottlenecks. In the current technological and industrial situation, how to construct the "Blue Granary" effectively has become a hot topic. Here we elaborated the definition, particularity, necessity and feasibility of "Blue Granary" construction in a systematic and deep-going way. We suggested that the construction of "Blue Granary" should help to realize the transformation from a big industrial country to a strong one and to achieve the goal of improving the ability of scientific and technological innovation. What's more, the implementation approaches have been proposed from the following aspects:focusing on major needs, constructing the value chain of scientific and technological advances; adhering to the original drive, making breakthrough at important scientific issues; strengthening integrated demonstration, supporting the healthy and sustainable development of the industry. Specifically, we should commit to the general principle of ensuring ecological priority and coordination of land and sea integrated development plans in accordance with the requirements of basic research, major common key technologies, and typical application demonstrations of the entire chain. Then, we continued to take four major measures including seed breeding drive, technology upgradation, space expansion, and industrial demonstration, in order to meet the industrial demands, namely germplasm creation, healthy aquaculture, resources conservation, friendly fishing, and circulation processing. In the meanwhile, we need to build three systems of smart farming, intelligent fishing and green processing, and to accomplish two goals of high-quality protein supply and industrial transformation and upgrading, all of which eventually will make contributions to construct a blue granary with Chinese characteristics.