The first submission of the doctoral thesis was not delayed for half a year, and then it was submitted for review. It will show how many times the thesis has been submitted. I have three opportunities to submit my doctoral thesis for review, and my graduation will be postponed after three submissions. A doctoral thesis is an academic thesis written by a graduate student who is pursuing a doctoral degree. Under the guidance of doctoral supervisor, the author is required to choose the potential research direction that he can grasp and control and open up new research fields. The author is required to have a great deal of theoretical knowledge in this discipline, have a deep understanding and thinking about the theoretical knowledge of the major he has studied, and have a considerable level of independent scientific research ability, and be able to put forward unique opinions and valuable scientific research achievements in the discipline.