When writing a thesis, the following behaviors may be judged as plagiarism: directly copying other people's words or paragraphs, using other people's research results without quoting, changing sentence structure but still using other people's views, and using other people's charts and data without permission. These behaviors will be recognized by the duplicate checking system and marked as possible plagiarism.

By comparing the existing literature and network resources, the duplicate checking system analyzes the text similarity in the paper and judges whether there is plagiarism. Common duplicate checking systems use some algorithms and techniques, such as TF-IDF (word frequency-inverse document frequency) algorithm and cosine similarity, in order to quickly and accurately judge the originality of papers.

In order to avoid being judged as plagiarism, the author needs to pay attention to some writing skills. First of all, we must ensure that when quoting other people's data, research results or words, we must clearly mark the source of the citation and use the citation format. Secondly, we should avoid directly copying paragraphs in other articles, express them in our own language, and add personal thinking or analysis. In addition, we should avoid relying too much on a certain literature or research, read the relevant literature extensively, and put forward original opinions and viewpoints in combination with our own research.

In short, when writing a thesis, how to avoid being judged as plagiarism is a problem that every academic researcher must pay attention to. The originality and academic integrity of the paper can be effectively guaranteed by correctly quoting and flexibly using other people's research results and combining with their own analysis. In addition, the duplicate checking system can also help students and researchers improve the quality of papers and increase the transparency and fairness of academic circles.