First of all, the paper is set to ensure academic integrity and intellectual property protection in academic circles. In the current academic environment, academic misconduct is becoming more and more serious, including plagiarism and plagiarism. Therefore, it is necessary to introduce duplicate checking mechanism, which can effectively detect similar contents in papers and punish plagiarism.

Secondly, the reasonable operation of the duplicate checking system can ensure the fairness and justice of the academic evaluation system. In the process of marking papers, judges often judge unfairly and are lazy in marking papers. The duplicate checking system can objectively check the duplicate of the paper, avoiding the interference of subjective evaluation and ensuring the objectivity and fairness of the evaluation results.

However, the existing duplicate checking system also exposes some unreasonable problems. First of all, some duplicate checking systems are too sensitive to label common words and academic terms in papers, which leads to more misjudgments. This has brought unnecessary trouble and waste of time to the author. Secondly, the databases in some duplicate checking systems are not comprehensive, and some professional fields at home and abroad may not be covered by duplicate checking systems, thus affecting the accuracy of duplicate checking. Paperfree is very suitable for checking and modifying the first draft.