The direct purpose of paper duplication checking is to detect the results of paper repetition rate, and colleges and universities will stipulate the qualified standards of paper repetition rate. Generally speaking, the paper duplicate checking system counts duplicate contents by marking them in red. Different duplicate checking systems have their own duplicate checking algorithms, and uploaded papers will be compared with database documents. If the duplicate checking algorithm is used to compare the repeated similar contents, the repetition rate of the paper will be judged. The repetition rate of a paper is the percentage of the number of words in the repeated content to the total number of words in the paper, and what the school finally sees is mainly the total repetition rate of this paper.