The applicant and the main participants shall sign the paper application form. If there are people outside the supporting unit (including graduate students, but excluding overseas personnel) among the main participants, their subordinate units shall be regarded as cooperative research units, fill in the information of cooperative research units in the basic information table of the application form and affix the official seal of cooperative research units on the signature page, and the name of the units filled in shall be consistent with the official seal. The cooperative research unit that has been registered with the Natural Science Foundation of China shall be stamped with the official seal of the unit registration; Unregistered cooperative research units shall be stamped with the official seal of the legal entity. 1 There are no more than 2 cooperative research units for application projects.