General Fund is the most basic supported project category of National Natural Science Foundation, also known as general project. It is the main part of the research project series of the National Natural Science Foundation, and supports the scientific and technical personnel engaged in basic research to independently select topics within the scope of the National Natural Science Foundation's funding, carry out innovative scientific research, and promote the balanced, coordinated and sustainable development of various disciplines.

Free application projects are the main part of the work funded by the National Natural Science Foundation, accounting for more than 80% of the total funds of general funded projects. Centralized acceptance and review once a year. The projects of the Youth Science Fund are the same as those of free application, but the applicants must be young scientists under the age of 35, have a doctoral degree or above the intermediate level, be able to independently carry out research work, have active academic thinking and have pioneering and innovative spirit.