1. Requirements for format: the format of the whole paper may have an impact on the test results. It is necessary to submit the final submission format for testing, so as to minimize the impact, and dozens of blocks may not be detected. Will not affect the passage. The algorithm of the system is complex, and there may be small plagiarism that was not detected for the first time after each modification (after two years of practical experience, the small plagiarism will not exceed 200 words, and the plagiarism rate will generally be greatly reduced after the second modification). 2. The comparative databases are: online publishing database of academic journals in China, full-text database of doctoral dissertations in China/full-text database of excellent master's dissertations in China, and full-text database of important conference dissertations in China. Comparative databases such as full-text databases of important domestic newspapers and periodicals, full-text databases of domestic patents and personal comparison databases, and some books are not in HowNet database, so plagiarism cannot be detected.