The preface of the paper is also called introduction, which is a short paragraph in front of the text. The preface is the preface of the paper, which aims to explain the ins and outs of this study to readers, arouse readers' interest in this paper, and play a role in outlining and guiding reading interest in this paper. Before writing the preface, we must first clarify several basic questions: What do you want to explain through this article? What are the new discoveries and whether they have academic value? After reading the preface, the general reader can clearly know why the author chose this topic for research.

The content of the introduction:

Introduction, as the beginning of the paper, briefly introduces the writing background and purpose of the paper, the origin and realistic requirements of the research, as well as the preliminary work and research survey in related fields, and explains the relationship between this research and the preliminary work, the current research hotspots, existing problems and the author's work significance, which leads to the theme of this paper and guides readers.

The writing method of the introduction of the paper:

1, ask questions. At the beginning of the paper, the author should describe the problem he found or raised in as concise a language as possible, and further point out the importance of this problem in practical application.

2. Theoretical basis and basic ways to solve difficulties. This is also the core content of the paper. In the paper, the emphasis is on whether the theoretical basis and methods to solve the problem are novel. The author has the right to fully and briefly discuss the new ideas and methods to deal with the problem and the analytical framework or model used by the author.

3. reference materials. All the creations of this thesis are based on predecessors, and the author is qualified to review the achievements of predecessors in this field. This paper not only respects the predecessors, but also discusses the innovation of this paper by comparison.