The doctoral thesis of China Agricultural University is difficult to answer. The chances of passing are very low. The probability of failing to pass the thesis defense is very low. Thesis defense is the last link for students to graduate. There is a blind review of the thesis before the thesis defense. If the quality of your article is poor, you can't pass the review in blind evaluation. Generally speaking, after the blind evaluation, if the paper passes the evaluation and is revised according to the opinions of peer review experts, then your chances of passing the exam are very high.