If the doctoral defense fails, the doctoral thesis defense will become more and more strict from the annual sampling inspection organized by the Ministry of Education in 20 14 (sampling inspection of doctoral thesis in the previous year 10%, sampling inspection of master's degree in 5%). If there are many unqualified doctoral dissertations, the doctoral dissertation awarding point will be cancelled. Introduction to information related to doctoral defense: all colleges and universities have strict requirements, and many 985s have pre-defense, that is, before the doctoral thesis is formally submitted for review, experts are organized to conduct pre-defense (generally speaking, these experts are also experts who formally defend the doctoral thesis after the external review has passed), and the pre-defense will be formally submitted for review. If the subject says that the pre-defense fails, it will be revised according to the requirements of the defense experts, and you can apply again after the revision. After the external trial, the defense is basically passed. If the defense really fails, then according to the requirements of the expert group, carefully modify it and apply for a second defense. If in the process of writing your doctoral thesis, the tutor thinks that your writing is not good, then you should revise it carefully according to the tutor's requirements and need to do the experiment again, because this is responsible for yourself and the school.