Literature review is a common paper type in academic research, which usually needs to sort out, summarize and evaluate the previous research results. When writing a literature review, you need to quote a lot of literature, so there may be a certain repetition rate. Specifically, the duplicate checking rate of literature review is related to the following aspects: 1. Number of cited documents: Literature review needs to cite a large number of documents, so its duplicate checking rate may be relatively high. However, if the number of cited documents is appropriate and the citation method is correct, the duplicate checking rate will not be too high. 2. Citation of literature sources: Literature review refers to various literature sources, including periodical papers, dissertations, monographs, conference papers, etc. Among them, the duplicate checking rate of periodical papers and dissertations is relatively high, because they are often authoritative and formal academic documents. 3. Contents of cited documents: The contents of cited documents in literature review may sometimes be repeated with other documents or similar to their own papers. Therefore, when quoting documents, we should pay attention to following academic norms, using citation format correctly, reading and understanding the cited documents fully, and avoiding duplication or plagiarism. In a word, the duplicate checking rate of literature review is related to the quantity, source and content of cited documents, so we should follow academic norms and citation formats in the writing process to avoid duplication or plagiarism. At the same time, you can also use related duplicate checking tools to check whether your papers are too similar.