The background of Du Fu's thesis is to state the background of Tang Dynasty and explain what kind of social background or market environment the thesis came from. Pave the way for questions. Meaning is the value of the paper. By asking questions, explain what the research purpose of this paper is and what contribution it has made. That is, why we should study this problem, what theoretical significance or practical application value it will have after in-depth study, and what guiding role it will have on reality.