Duplicate checking of graduation thesis is a test of the repetition rate of thesis. In order to protect students' papers from plagiarism and patents, it is expressed as an academic misconduct detection system. In order to create a positive social atmosphere, school duplicate checking is also a positive response to national policies. Nowadays, the society pays more and more attention to copyright issues, and papers are also part of intellectual property rights. Therefore, it is also very important for schools and institutions to check the duplicate.