Major national science and technology projects. National major projects belong to the national science and technology major special fund, aiming at achieving national goals and narrowing the gap with developed countries through the leap-forward development of science and technology, taking major strategic products, key technologies or key supporting technologies as a breakthrough, and relying on the long-term, high-input and large-scale technical research practice of national science and technology major projects to solve major, key and forward-looking technical problems in economic and social development.