Blind trial is a kind of paper review system. In order to ensure the objectivity and impartiality of the review, the tutor did not know the name of the paper when reviewing, that is, he submitted the paper anonymously for review. Teachers' colleges will conduct blind examination before thesis defense. Randomly select several papers to submit for review. Due to the different organizations submitting the audit, there are internal audit and external audit. Internal audit refers to the audit expert group sent to the school, and external audit is conducted by experts from external units.