Previous graduate papers will be included in the scope of duplicate checking. According to the public information about the query, more data can be collected by including the papers of previous graduates in the scope of duplicate checking, thus improving the accuracy and reliability of the detection. At the same time, more statistical information and trends can be obtained by using these data, thus guiding schools or institutions to better formulate relevant policies. Duplicate checking refers to comparing a text to determine whether there is the same or similar content with other texts, so as to judge whether there is plagiarism in the text.