See what topic, and see if there are any new data. If there is new data, it is a principle that old data cannot be used; Or take the old data as comprehensive system data, and then provide important single data as a supplement in the new data in a narrative way. The data of some topics seem old, but they are actually new, because the real-time data reflecting the actual situation has not been released, and I have no ability to calculate it myself. Undergraduate graduation thesis is to write a research, including the following steps: orientation-downloading literature-reading literature-setting outline and topic-writing thesis-revising final draft-checking final draft-defending. The originality and readability of graduation thesis must be guaranteed, and the final duplicate checking system required by the school must be clearly understood. At present, the final duplicate checking systems in colleges and universities include HowNet, VIP, paperfree and paperpass. Except for 1-2 free duplicate checking opportunities in colleges and universities, third-party duplicate checking is a paid test, which does not support authenticity verification and lacks some databases. Students should choose carefully, so as to avoid the inconsistency between the duplicate check results and the final duplicate check results of colleges and universities, and delay graduation. The first draft can be consulted permanently and freely through paperday, and some students have a high repetition rate of graduation thesis. You can refer to how to reduce the repetition rate of papers.