Dissertation is an important basis for comprehensively testing graduate students' learning quality, theoretical accomplishment and academic level, an important means to comprehensively cultivate graduate students' ability to work independently, integrate theory with practice and engage in scientific research, and an important link in training. Opening a topic is not only an important step for graduate students to determine the topic, but also an important way for graduate students to strengthen communication, deepen understanding, gather wisdom, clear their minds, make up for deficiencies and ensure the correct implementation of the topic.