1. Improper research methods: If there are problems in the research methods of the paper, such as unreasonable sample selection and inaccurate data collection and analysis methods, then the paper needs to be greatly changed.

2. Insufficient literature review: Literature review is an important part of the paper. If the literature review is not sufficient or does not cover the latest research results in related fields, then the paper needs to be greatly revised.

3. The conclusion is unclear or inaccurate: If the conclusion of the paper is unclear or inaccurate, then the paper needs to be greatly revised.

4. The data analysis results are not in line with expectations: if the data analysis results are not in line with expectations, then the paper needs to be greatly revised.

5. Unclear language expression: If the language expression of the paper is unclear, for example, the sentence structure is chaotic and the words are not used properly, then the paper will be greatly revised.

6. Format does not meet the requirements: if the format of the paper does not meet the requirements, such as incorrect reference format and irregular drawing number, it is necessary to make major revisions to the paper.

7. Lack of innovation: If the paper lacks innovation and only repeats the existing research results, it needs to be greatly changed.

8. Unclear logical relationship: If the logical relationship of the paper is unclear, for example, the relationship between the parts is not close enough and the argumentation process is not rigorous enough, then the paper needs to be greatly changed.