Food security is not only an economic issue, but also an important social issue. To ensure national food security, China has to study and evaluate correctly changes in supply and demand in the future; carry out the three development requirements of Great Food View, full industry chain and new greening; draw the alerting line for food security standards and resource utilization; differentiate importing categories and the order of priority; set clear development goals and enhance basic support and technical support. Based on the strategic concept of sustainable development of food security in the future, the paper proposes policy suggestions including setting the core strategy of being basically self-sufficient in grain, speeding up the implementation of the major project of building 1 billion mu of high standard farmlands, carrying out creative operation modes and cultivating the new type of agricultural business entities, improving laws and regulations, promoting the development process of modern agriculture, etc.