The preface of a paper is generally the first paragraph of a three-stage paper, and the preface and abstract of the paper are not exactly the same. The abstract of the paper is a high summary of the paper, which is slightly shorter than the preface, which is much more specific to the abstract. In general, it is best to keep the number of words in the preface around 1000 words. Usually, the preface includes the following contents:

1, what is the purpose of writing this paper, what problems need to be solved, and what is the main point of this paper.

2. Within the scope of this study, there is an evaluation price for the literature.

3. Explain the problems to be solved in this paper and the research methods adopted in this paper.

4. Summarize the research results and significance of this paper. These are some formats of the preface when writing a paper.

When writing the preface of a paper, we should first pay attention to whether the format of our preface is correct, and write several contents contained in the preface on the premise of correct format. Usually, several contents contained in the preface are essential. Furthermore, the number of words in the preface of the paper should not be too much or too little. Too few words will make the preface incomplete, and too many words will make the preface too long, so it is better to be moderate.