Master of Beihang University can't argue, but. There are two chances to defend the master's thesis of Beihang University. If the thesis fails once, the Committee will propose amendments, and candidates can reapply for defense within one year after half a year. When defending a thesis, candidates should not recite it according to what is written in the thesis. As long as we explain the theme, purpose and reason of this article and the direction of content research, we need to express our original opinions and new breakthroughs in this article, so as to be concise and not to take up too much time.