In thesis writing, plagiarism is a serious academic misconduct, which not only violates the principle of academic integrity, but also may cause serious damage to the author's academic reputation. Here are some common forms of plagiarism:

1. Copy and paste directly: This is the most common form of plagiarism, that is, copy the text directly from other sources and paste it into your own paper without any quotation or comment.

2. Rewriting and Restatement: This form of plagiarism refers to rewriting or restating the original text, but retaining the main idea and structure of the original text. Although this method may be more difficult to find than copying and pasting directly, it is still plagiarism.

3. Partial citation: This form of plagiarism refers to only quoting part of the original text without giving complete citation information. This may mislead readers into thinking that this part is the author's own opinion.

4. Over-citation: This form of plagiarism refers to over-reliance on other people's research, so that one's originality is insufficient. Even if all the citations are correctly marked, too many citations may lead to a decline in the quality of the paper.

5.*** Enjoy ideas or data: If two or more authors independently reach the same conclusion or use the same data for analysis, then they may be considered to be copying each other's ideas or data.

6. Use other people's research methods or theoretical frameworks: If an author uses other people's research methods or theoretical frameworks without proper citation, then he may be considered plagiarism.

In order to avoid plagiarism, authors should always ensure that their papers are original and all the information cited is correctly marked. In addition, the author should avoid relying too much on other people's research, but should strive to cultivate his own thinking and analysis ability.