About five months. 1986 February 14, the State Council approved the establishment of the National Natural Science Foundation Committee. Generally, it takes about 5 months for the projects of the National Natural Science Foundation to be approved. The joint fund established by the National Natural Science Foundation of China and China Academy of Engineering Physics aims to guide domestic researchers in related fields to participate in basic and applied research involving national security, open up new research directions, discover new phenomena and laws, enhance the innovation ability of national defense science and technology, and cultivate young scientific and technological talents needed in the field of national defense science and technology through the management method and evaluation system of the National Natural Science Foundation.