(1), cut to the chase and don't beat around the bush. Avoid long-winded narration of historical origin and research process.
(2) Be concise and focused. We shouldn't talk too much about the familiar common sense content of colleagues and textbooks. When it is really necessary to mention other people's research results and basic principles, we only need to mark them in the form of quotations. In the introduction, when putting forward the work and opinions of this paper, we should make the meaning clear and the language concise.
(3) Reviewing the history should be focused, the content should be closely related to the title of the article, and the background should be introduced around the title, which can be summarized in a few words; Don't write out the methods and results and don't discuss them when prompting the methods used; Although the contents of past documents can be quoted appropriately, they should not be listed in detail, and the preface should not be written as the historical development of research; Don't write the preface as a small summary of the literature, and don't repeat the common sense content already in the textbook or known by researchers in this field.
(4) Respect science and seek truth from facts. In the preface, we should properly evaluate the value of the paper, seek truth from facts and use scientific words. For the innovation of this paper, it is best not to use inappropriate self-evaluation such as "This study is the first report in China", "Filling the domestic blank", "High academic value", "This study has not been reported in China" and "This study is at the leading level at home and abroad". (5) The content of the preface should not be the same as that of the abstract. Pay attention to using polite expressions, such as "a little knowledge", "limited level", "please correct me" and "throwing a brick to attract jade". It is best not to discuss the preface in sections, not to illustrate and list, not to deduce and prove formulas. Li, at present, the main research results of biomechanical analysis of pole vault in China focus on the change of speed, take-off angle and chord angle. However, the limitation of this research method is obvious: it ignores the interaction between people and poles, and there is no suitable index to reflect the ability of athletes to use pole elasticity. Foreign countries have adopted energy analysis to solve this problem, that is, by analyzing the changes of human mechanical energy to reflect the ability transfer between the two poles. Therefore, it is necessary to introduce the energy analysis method into the biomechanical analysis of pole vault in China. However, foreign literature only gives a simplified formula in energy analysis, and does not explain the specific calculation method. (Journal of Beijing Sport University,No. 12, 2006) Example 2: What is the research on the influence of high-intensity exercise on EEG activity? Lu Haitao's electroencephalogram (EEG) reflects the activity of neurons in cerebral cortex and the functional state of central nervous system, which is the only reliable method to detect brain function. At present, the changes of EEG after high-intensity and long-term exercise have not been reported in detail. The purpose of this paper is to understand the changes of EEG after high-intensity exercise, master the changes of EEG indexes after high-intensity load, explore the basic laws of activities, and provide theoretical basis for scientific arrangement of physical education teaching and training. Text is also called introduction, preface or introduction. Scientific papers are mainly composed of introduction, theory (results and discussion) and conclusion. The introduction puts forward problems, and this theory analyzes problems and induces and solves them. The introduction is the opening work. It is difficult to write an introduction before writing a book. In ancient literary theory, it was known as "crested pig belly and leopard tail". Although scientific papers will not emphasize that the beginning of the article is as beautiful, wonderful and fascinating as the phoenix head, the introduction is the first impression to readers and plays an important role in outlining the full text, which cannot be taken lightly. 1. The content and format of the introduction (1) explain the theme, scope and purpose of the paper. (3) Expected results or the significance of this study. (4) The introduction is generally not segmented, and its length depends on the content of the paper. The introduction of papers involving basic research is long, and the clinical case analysis should be short. The introduction of most foreign papers is relatively long, generally around 1000 words, which may be related to the strict limitation of the number of words in foreign domestic journals. The so-called introduction is to set a topic for the writing of the paper, with the purpose of introducing the following. Only when the "proposition" is established, it is necessary to continue writing the paper, otherwise the writing of the paper will lose its meaning. The general introduction includes two meanings: first, the background of "topic selection", which explains the position and role of topic selection in this discipline and the research status, especially the existing or unsolved problems in the research. The second is to establish the problems to be solved in this paper according to the existing research situation, which leads to the following. There are two problems in the introduction writing of the general author. 1) The article is irrelevant and general. Some authors seem to regard the introduction of the paper as a form and a dispensable part, and separate the writing of the introduction from the writing of the text just to add a hat to the paper. It is a common phenomenon to discuss the importance of research in general, even from the position of the industries involved in technology in the national economy, just like the leader's speech. It is the theme of research, and it is also from macro to micro, staying in general terms. Obviously, as a result, readers can't accurately judge the specific value of "thesis proposition", and they also lack the summary and introduction of the research status quo. I wonder what is the difference between the author's research and previous research work? Therefore, the introduction of scientific papers must explain the background of research work and generally discuss the current situation of research problems. The discussion of the research status is not only to examine the author's possession and familiarity with the materials, but more importantly, to judge the significance and value of the research work and the credibility of the research results from the comprehensive degree and the old and new degree of the materials. 2) Citations are listed and lack of analysis and generalization. The introduction should not only reflect the breadth of the background, but also examine the author's understanding of the research background. Generally speaking, the author has no deep understanding of the problem studied. When introducing the current research situation, he often lists a large number of references, lists different practices and conclusions of different researchers, lacks the author's analysis and induction, fails to summarize the research results and existing problems, and some even list some documents that are not directly related to this research, unilaterally emphasizing the richness of information possession. Although some people think that different magazines have different requirements for the introduction of research status, from the perspective of paper writing, the purpose of introduction is to explain the significance of the thesis proposition, not to summarize the research data, although summary provides convenience for readers to find information. Therefore, we should use the author's own language to summarize the current research situation, especially the existing difficulties and shortcomings, thus leading to the theme of the paper.