Update of duplicate checking system: The database and algorithm of duplicate checking system are constantly updated, which leads to the duplicate content that was not detected in the last duplicate checking to be detected in the revised duplicate checking, thus improving the duplicate checking rate.

Poor revision effect: in the process of revision, the revision effect may be poor because of inaccurate grasp of some sentences, and the repeated parts will still be repeated when retesting, which leads to the increase of the repetition rate after revision.

Increase the number of words: Some people dilute the repetition rate by increasing the number of words, but this method may also lead to an increase in repetition rate. Because the increased number of words may add new repetitive content, which will increase the duplicate checking rate.

Different duplicate checking file formats: If the duplicate checking file format is changed during the modification process, for example, it was originally in Word format and later changed to PDF format, the duplicate checking rate may be improved.

Paper duplicate checking website problem: There are various duplicate checking systems at present, so it is very important to choose a reliable system, such as papertime, which is recommended.