The meaning of case paper is to analyze the main points of the paper with one or several cases as clues. These cases can be included in each chapter and analyzed in combination with the specific requirements of each chapter. It may also be a good case, which can reflect most aspects of the article, that is, first analyze the article in a normal context, and finally have a separate chapter for case analysis. Now the general papers are the latter. If each chapter writes a case and then analyzes it, it is actually not easy to control.