Difference 1. The reasons for the defense are different.

The first defense is mainly for the school to organize a thesis defense. In short, it is to further investigate the paper, that is, to further investigate and verify the author's understanding of the topics discussed in the paper and his ability to demonstrate the topics on the spot; Investigate the depth and breadth of the author's mastery of professional knowledge; Review whether the thesis is completed by the students themselves, etc. And the second defense failed to pass the graduation thesis and then defended.

The second difference is that the reply time is different.

The first defense is mainly organized by the school, and the students' defense is unified. The second defense is mainly because the first defense failed, and the school will reschedule the defense.

Difference three. The result is different.

The purpose of defense is to pass, graduate on time and get a diploma, so students who pass the defense for the first time can graduate on time and get a diploma. The purpose of the second defense is not to affect graduation. After discussion by the defense Committee (or the degree conferring Committee), it is decided to give the students who failed in defense another chance to graduate successfully.