If the graduation defense is only a debate contest, if it fails, the teacher or the leader of the professional group will arrange to enter the second debate contest. If you don't have too much "hatred" with the instructor or the leader of the professional group, you will definitely pass the second debate if you are fully prepared. )

If you mean the second debate, you will face two aspects:

First, I will be called by the dean to do a long interview (I don't know what to talk about);

Second, study for another year.

All the above things you want to see or don't want to see depend largely on your attitude.