Key projects and major projects. According to the inquiry of official website, the People's Government of China, the National Natural Science Foundation is an important part of the national innovation system, which mainly supports the basic research and some applied research of natural science, and focuses on supporting researchers in universities and scientific research institutions with good research conditions and research strength. Fund projects refer to all kinds of projects funded by the National Natural Science Foundation, including general projects, key projects, major projects, national science foundation projects for outstanding young people, special projects and international cooperation and exchange projects.