The application time for the Youth Fund of the National Natural Science Foundation of China is February 15. After completing the application writing, the applicant submits the electronic application form and its electronic attachment materials online, downloads and prints the final PDF version of the application form, and submits the original signed paper application form to the supporting unit, without submitting paper attachment materials (except the original paper materials such as certification letter and recommendation letter). Applicants should ensure that the paper application is consistent with the electronic version.