The so-called "double blind" refers to the "blind drawing" and "blind evaluation" of bid evaluation experts. "Blind Selection"-All bid evaluation experts are randomly selected from the unified bid evaluation expert database in the province through the expert selection system, and the system does not display the names, contact numbers and other information of the selected experts. "Blind evaluation"-the bid evaluation experts score without knowing the information of bidders, and the system automatically summarizes the scores and determines the winning candidate according to the procedure. Blind evaluation is a system of organizing expert group evaluation. Anonymous submission means that the reviewer does not know who the author of the paper is. In this way, the false rate of scores is low, so colleges and universities use this method to mark papers. Sending dissertations without the author's name to experts who can't know the author for evaluation should be the most objective. Colleges and universities in general, especially graduate schools, have relevant regulations on blind examination of papers on a regular basis, and most of them randomly select a certain number of papers for blind examination.