At present, there are dozens of websites for duplicate checking of papers, and the intensity of duplicate checking is different. Among them, HowNet duplicate checking, Victoria census duplicate checking and Wanfang duplicate checking are the testing systems used in the finalization of colleges and universities, all of which are paid testing. At least dozens of papers should be used for the first draft and the middle draft, and free duplicate checking software such as paperbye and paperpass can be used. Among them, paperbye is not only limited to the number of articles and words per day, but also supports testing institutions to quickly reduce the repetition rate of papers while making corrections. It is also a common way for most graduates to check duplicates.