National fund refers to the fund established by the state to support scientific and technological research and development. National funds are managed by the Ministry of Science and Technology, the National Natural Science Foundation of China, the Ministry of Education and other government departments or institutions. The Aviation Science Fund was established by China Aviation Society, aviation industry corporation of china, Civil Aviation Administration of China and other units to support the research and development of aviation science and technology in China. As a state-level fund, the aviation science fund is supervised and managed by the state, which has high credit reliability of scientific research funds and authority of scientific research results.