The defense of graduation thesis is based on my own graduation thesis. The teacher of the defense Committee asks you questions and you answer them. So the topic of graduation thesis is the topic of your thesis defense. Some teachers give students a lot of paper topics to choose from, one topic for each person, which cannot be repeated, while others let students decide their own topics and give them to the teacher for later use. So I don't know what you want to ask, or you can look for the matters needing attention and topics in the defense of undergraduate thesis of law in the school's paper duplication check.