Generally speaking, the length of studying for a doctorate in Britain is 3 years of scientific research plus 1 year of writing a doctoral thesis. In the early years, the demand for doctoral research results seemed to be higher and the duration was relatively loose. Some students studied for 6 or 7 years. Now the school is weighing the relationship between time and quality, requiring graduation in four years.

1. The doctoral system in Britain is tutorial system, and the tutor decides whether the doctoral thesis is passed or not. Once the tutor thinks that the thesis has reached the graduation level, it will be sent to the peer review nominated by the tutor, and the follow-up defense will be jointly conducted by the tutor and the reviewing professor. This defense is like an oral exam. Two professors spend several hours or a day answering questions with students about their doctoral thesis.

2. Different from domestic doctors, the most important part of British doctoral graduation is not to submit a thesis, but to defend it. There are two examiners for the defense, one on campus and one off campus in related fields. During the defense, the examiner is locked in a small room with you, and the examiner asks you questions according to your paper. The defense time is usually three or four hours, but I have seen seven hours. After the defense, the examiner will revise your paper and defense suggestions. As long as the paper is completed, the examiner will be OK if he passes the second interview. It may also be necessary to resubmit the paper or re-defend; The most unfortunate thing is to fail directly and change to MPhil (Master of Philosophy, if you choose not to write a thesis, you can take the title of MPhil directly).