Class A According to Baidu Big Data, the full name of China is National Natural Science Foundation, which was put forward by 89 members of the Chinese Academy of Sciences in a letter to the State Council, the Central Committee of the Communist Party of China, in the early 1980s to promote the reform of China's science and technology system and change the allocation of scientific research funds. General conference is a common proportion in the application of National Natural Science Foundation, and its AAA, AAB, AAC and abb all belong to Class A conferences, which are scientific programs that can apply for funds first and get fund support.