Print articles and send them to friends to share [Abstract] I usually choose a few very classic documents and set up email tracking and feedback functions in all databases, so that I can learn from each other's strengths, track them at any time and analyze them comprehensively. Another significance of a return visit is to reread some important documents. Reading documents is different from reading novels, and sometimes reading them repeatedly will bring completely different new gains. Sun's scientific research work can't be separated from reading a large number of documents, but sometimes time is too tight to take care of all the documents, and sometimes there are so many hot documents that it is impossible to read them comprehensively. How to solve these problems? First, document tracking Many databases have the function of document tracking. For example, both SCI database and goolge academic have the function of document tracking. However, considering the immediacy of documents, goolge academic is still relatively good, and it will be tracked at any time as soon as it appears, but the disadvantage is that documents are miscellaneous, such as blog documents. SCI database is relatively accurate, but many documents often need to wait for a long time to be included, so it is difficult to track the documents at any time. Therefore, from the perspective of classical literature analysis, SCI database can be used, but from the perspective of the latest literature tracking, goolge is better academically. Other databases have their own advantages and disadvantages and can be selected according to their own needs. I usually choose several very classic documents and set up email tracking feedback function in all databases, so that I can learn from each other's strong points, track them at any time and analyze them comprehensively. Second, key intensive reading The so-called key intensive reading means reading important documents in full text, which can be read repeatedly, carefully understood, and even tracked according to references. The fundamental purpose is to fully understand the progress in this field. In-depth understanding of some important progress, and on the basis of these readings, try to summarize and refine, you can write a summary or comment according to the situation, you can also put forward some new ideas and ideas according to the progress, you can express some opinions or directly modify or supplement the past research plan. There are two main types of key documents in a domain. One is a comprehensive literature, especially written by leading scientists in the leading team in this field, which must be good-looking. For example, the articles of top scientists such as Yuan, Wang Xiaodong and Han Jiahuai must be good-looking, and the other is the document of key progress. The literature in this field is generally published in top journals, which is relatively easy to determine. Third, regular return visits Although you can basically understand important documents through the above two means, some good documents will be ignored by yourself, so you need to go through a stage of literature return visit. The literature in this field, especially the literature in recent two years, is comprehensively searched and analyzed. By comparing the citation rate, we can initially understand which documents are most concerned by peers. Of course, these documents have their reasons for concern, and they are often better documents. Another significance of a return visit is to reread some important documents. Reading documents is different from reading novels, and sometimes reading them repeatedly will bring completely different new gains. Reading literature should be a living habit of researchers. Only by reading more documents can we get new information continuously. In this era of information explosion, on the one hand, we are suitable for the convenience of literature acquisition, on the other hand, we will be bound by the huge literature forest. If you can't analyze absorption, reading too much will be harmful, and even you will suffer from indigestion syndrome, which also needs to be overcome.