The blind evaluation system is to send dissertations without the author's name to unknown experts. This score should be the most objective. General colleges and universities, 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. Only by passing the blind test can you get the right of reply, and you can't graduate if you don't pass the reply. As long as the two experts pass the blind trial, they will have the right to defense. The defense Committee does not include experts who passed the blind trial, and only half of them can graduate.