1. Intensified academic competition: With the expansion of graduate enrollment every year, the number of applicants for graduate students is also increasing, which makes the competition for graduate qualification papers more intense. At the same time, more and more outstanding undergraduates choose to continue their graduate studies, which improves the overall level of graduate students and the requirements for papers.

2. Reform of academic evaluation system: In order to improve the quality of postgraduate training, colleges and universities have reformed the academic evaluation system and strengthened the examination and evaluation of postgraduate qualification papers. This makes graduate students need to pay more attention to research quality and innovation when writing papers, thus improving the difficulty of papers.

3. Reduce academic misconduct: In recent years, colleges and universities have intensified their efforts to crack down on academic misconduct and strictly standardized the process of writing and publishing papers. This makes graduate students need to be more rigorous in writing papers and avoid plagiarism, thus improving the difficulty of papers.

4. Subdivision of research fields: With the deepening of academic research, the research fields are constantly refined, and graduate students need to pay more attention to the research in a certain field when writing a thesis, which requires graduate students to have higher professional quality and research ability, thus improving the difficulty of the thesis.

5. Tutors have higher requirements for students: In order to improve the quality of postgraduate training, tutors will pay more attention to students' independent thinking and innovation ability when guiding students to write papers. This makes students need to make more efforts in thesis writing, thus improving the difficulty of the thesis.

In short, due to the interaction of many factors, it is more and more difficult to issue graduate qualification papers. In order to meet this challenge, graduate students need to constantly improve their academic literacy and research ability, and strive to write high-quality papers.