You can't. Because the examination and approval requirements of doctoral thesis are very high, it needs to be completely original, and there are no references, so the contents of previous papers cannot be used. Thesis is a Chinese word, commonly used in classical literature, which means to talk or exchange ideas. Nowadays, papers are often used to refer to articles that conduct research in various academic fields and describe academic research results, which are referred to as papers for short. It is not only a means to discuss problems in academic research, but also a tool to describe academic research results in academic exchanges. Including academic papers, graduation papers, dissertations, scientific papers, achievement papers and so on.