The principle of paper duplicate checking is to compare the manuscript to be checked with a large number of similar texts such as academic documents and internet resources through computer technology, and then evaluate the originality and uniqueness of the manuscript. Specifically, the duplicate checking system will compare the manuscripts according to a series of algorithms. Once the duplicate content is found, the system will mark it and calculate the duplicate content into the repetition rate of the paper.

In the process of comparison, the duplicate checking system will process the content in layers, create fingerprints according to the levels of chapters, paragraphs and sentences, and compare the comparison documents in the resource library with the same technology to create a fingerprint index. After the user uploads the paper to the duplicate checking system, the system automatically detects the paper, and can provide the duplicate checking report for the user after the duplicate checking is completed.

There is a threshold for the sensitivity of the repeated inspection system, which is 5%. In terms of paragraphs, plagiarism or quotations below 5% cannot be detected. Therefore, users should pay attention to modifying the undetectable parts of the paper when checking the duplicate papers to ensure the originality and uniqueness of the paper.

In addition, different brands of duplicate checking software have different algorithms and standards, so it is suggested to choose the same duplicate checking software as schools or institutions to ensure the consistency of duplicate checking results. At the same time, we should carefully read the specific requirements and standards of schools or institutions for duplicate checking of papers to ensure the quality and originality of papers.