Strict. The requirements of the blind doctoral examination in Northwestern Polytechnical University are stricter than those of the master's thesis, and there must be no serious scientific errors or format errors, otherwise the blind examination will fail and students are required to correct it. Blind evaluation is a kind of paper evaluation system. In order to ensure the objectivity and fairness of the evaluation, the tutor did not know the name of the paper during the evaluation, that is, submitted anonymously.