Ph.D. graduates from the world's top 200 universities (ranked by 20 17 to 20 19), or young scholars in all formal teaching and research positions in the world's top 200 universities and universities and research institutes (ranked by 20 17 to 20 100) Or young scholars who have been engaged in postdoctoral research for more than 1 year in the top 200 universities in the world, universities and scientific research institutes ranked first in the global natural index 100, or young scholars who have received special funding from China postdoctoral science fund can make an exception (except age).