This depends on the requirements of the project organizer. In most cases, the paper of the project conclusion must be published. If the published paper is not published, the project cannot be ended.
As one of the main channels to support basic research in China, the National Natural Science Foundation focuses on supporting researchers in universities and scientific research institutions with good research conditions and strength. In the early 1980s, the National Natural Science Foundation was put forward by 89 academicians of China Academy of Sciences in a letter to the CPC Central Committee and the State Council, with the aim of promoting the reform of China's science and technology system and changing the allocation of scientific research funds.