Punctuation marks play a key role in paper search. First of all, punctuation can increase the readability and logic of the paper. They play the role of connecting sentences, paragraphs and chapters in the paper, making it easier for readers to understand and understand the content of the paper. In the duplicate checking system, punctuation marks, as an important part of sentence structure and semantics, play an important role in judging the originality and repetition rate of papers.

However, the use of punctuation marks may also do some harm to the duplicate checking rate of papers. On the one hand, excessive or incorrect use of punctuation marks may lead to insufficient logic or grammatical errors in the paper, thus reducing the quality and originality of the paper. On the other hand, some special punctuation marks, such as quotation marks and brackets, may be recognized as special characters in the duplicate checking system, which leads to the system being unable to correctly match and identify the repeated contents in the paper.

In order to reduce the harm of punctuation marks to the duplicate checking rate of papers, the researchers put forward some suggestions. First of all, the author should follow the correct use of punctuation marks in the writing process to ensure the logic and grammatical correctness of the paper. Secondly, the developers of the duplicate checking system should consider the characteristics of punctuation marks in the algorithm design to improve the system's ability to identify and process punctuation marks. Finally, academic circles and educational institutions should strengthen punctuation education for students and researchers and improve their awareness and ability to use punctuation correctly.