Generally speaking, the purpose of graduation thesis defense is mainly manifested in the following three aspects.

First of all, further investigate and verify the author's understanding of the paper and his ability to demonstrate the topic on the spot.

Generally speaking, according to the papers submitted by the respondents, some problems have not been fully expounded, some may be limited by the overall structure, some may not be developed due to the limitation of space, and some may be that the author thinks this issue is not important or does not think it is necessary to elaborate;

Some of them are probably the weak links that the author deliberately avoided because he couldn't go deep or didn't know clearly, and some may be the shortcomings that the author didn't realize at all.

By asking and answering these questions, we can further find out what the author did not analyze in depth, so as to understand the respondents' understanding degree, understanding depth and ability to demonstrate the topic on the spot.

Second, further investigate the depth and breadth of the graduation thesis author's mastery of professional knowledge. The depth and breadth of respondents' knowledge can also be seen through the paper.

However, the main purpose of writing a graduation thesis is not to examine the depth and breadth of the respondent's knowledge, but to examine the respondent's ability to analyze and solve problems independently by comprehensively applying what he has learned, and to cultivate and exercise his own ability to conduct scientific research.

Part of the knowledge used by respondents in writing papers has been mastered and can be used comprehensively; Some may have a little knowledge and have not turned it into their own knowledge; Others may mechanically copy other people's articles, and the basic meaning is not clear.

At the defense meeting, the teachers of the defense group put forward some unclear, not detailed, incomplete, inaccurate and imperfect points in the paper for the author to answer on the spot, so as to test whether the author has a profound knowledge base, creative opinions and sufficient and solid reasons for the issues discussed.

Thirdly, the authenticity of the graduation thesis is tested by examining whether the respondent has completed it independently.

Writing a graduation thesis requires the respondent to complete it independently under the guidance of the teacher, but it is not completed under the strict supervision of the teacher like exams, but within a long period of time. It is inevitable that a few unconscious students will download from the internet or copy from newspapers with luck. Instructors must be strict, but it is difficult for a teacher to guide many different topics and different ranges of answers without omission.

The defense team is generally composed of more than three teachers, so it has a stronger ability to identify the authenticity of the thesis. Through the questions and defense at the defense meeting, cheaters can be exposed, thus ensuring the quality of the graduation thesis.