When the teacher is promoted to defense, the probability of drawing interest in mathematics is random. There are strict rules for teachers' promotion defense. Managers will randomly use computers to attend classes according to their own teaching time. When the respondent enters the defense site to introduce himself, he must be calm, don't get stage fright, pay attention to the time and speed of speech, and concretize the content he wants to defend or briefly summarize it in the form of a subtitle.