1. Lack of research experience: Undergraduates usually lack independent research experience and may be confused about how to choose and design research projects and how to collect and analyze data. This may cause them to encounter difficulties in the process of writing their papers and cannot accurately express their research results.

2. Time management: Undergraduates usually need to deal with their studies and other activities at the same time, such as club activities and part-time jobs. This makes it difficult for them to finish high-quality papers in a limited time. In addition, the writing process of the paper may need to be revised and improved repeatedly, which also requires a lot of time and energy.

3. Lack of writing skills: Undergraduates may lack writing experience and skills, and it is difficult to present their research results clearly, accurately and logically. This may lead to their papers being rejected or required to be revised during the review process.

4. Puzzlement of periodical selection: Undergraduates may be confused about how to choose periodicals suitable for their research fields. They may not know which journals are more influential and which journals pay more attention to certain research directions. This may lead them to choose inappropriate journals, thus affecting their chances of publishing papers.

5. Facing the pressure of peer review: After the paper is submitted, undergraduates need to face all kinds of opinions and suggestions put forward by peer reviewers. These opinions may be positive or negative, and may even involve the denial of the whole research. Undergraduates may lack the ability to cope with this kind of pressure, which leads them to feel anxious and depressed when facing peer review opinions.

6. Academic integrity: In the process of writing a thesis, undergraduates may encounter academic misconduct such as plagiarism and tampering with data. These problems will not only affect the quality of papers, but also lead to serious academic consequences, such as being rejected by journals and punished by schools.