Self-taught undergraduate students need graduation defense. Self-taught undergraduate degree is a degree with the same legal effect as ordinary undergraduate degree. Therefore, self-taught undergraduate students also need graduation defense. Graduation defense is an important link to show, defend and review the papers completed by students, and finally decide whether the papers are qualified or not. In graduation defense, students need to systematically explain their research contents, methods and conclusions, and answer questions from judges. Only after graduation defense and approval by the judges can we formally obtain the undergraduate degree of self-taught examination.