Each school has different regulations on duplicate checking rate, duplicate checking method and duplicate checking scope, but the gap will not be great. After all, duplicate checking is a paper, and it is impossible to do much. Generally speaking, the duplicate checking rate of undergraduate papers is not higher than 30%, and a few colleges are strict, and the duplicate checking rate is in the range of 15%~20%. Therefore, it is safer to control the repetition rate below 20% when reducing the weight of paper.

The master's thesis requires strict repetition rate, which is generally within 10%- 15%. In order to successfully pass the duplicate check, it is suggested to control it below 10%. After the paper is finalized, it is better to check it with the duplicate checking software designated by the school, instead of passing it with a duplicate checking software, and the result is affirmative.

The duplicate checking of English papers can be done through the duplicate checking system of HowNet.

The paper duplicate checking system of HowNet is the most authoritative paper duplicate checking system in China, which covers a wide range and is used by many universities. It has a large number of database resources and has a high accuracy in detecting the repetition rate of English papers. According to different types of papers, there are CNKI papers duplicate checking softwares, such as CNKI periodical AMLC, CNKI undergraduate PMLC, CNKI VIP5.3/TMLC2, which can be used for duplicate checking of master's and doctoral dissertations, plagiarism detection of college students' papers, evaluation of published literature titles, etc.