1. Academic misconduct: This is the most common reason. Including plagiarism, tampering with data, forging the identity of the author, etc. These behaviors seriously violate academic ethics and norms, and once they are discovered, they usually lead to the immediate withdrawal of the paper.
2. Repeated publication: If a paper is published in different journals for many times without any modification or supplement, it may also be regarded as repeated publication, which may lead to the rejection of the paper.
3. Data problem: If there are serious errors or inconsistencies in the data in the paper, or there are problems in the data collection and analysis methods, this may also lead to the withdrawal of the paper.
4. Research methods: If there are problems in the research methods of the paper, such as unreasonable experimental design and incorrect statistical analysis methods, it may also lead to the withdrawal of the paper.
5. Paper quality: If the quality of the paper is not high, such as unclear discussion, chaotic logic, lack of references, etc. This may also lead to the withdrawal of the paper.
6. Ethical issues: If the research of this paper involves ethical issues, such as conducting experiments without the consent of the subjects, causing harm to the subjects, etc. This may also lead to the withdrawal of the paper.
7. Copyright issues: If there are problems with the copyright of the paper, such as using other people's research results without the permission of the original author, this may also lead to the withdrawal of the paper.
8. Not meeting the requirements of the journal: If the content of the paper does not meet the requirements of the journal, such as inconsistent theme and unequal format, it may also lead to the rejection of the paper.