The third author of SCI papers is useful and can also be used to evaluate professional titles, but it is certainly not as convincing as the first author, and its role is weaker than that of the first author and the second author. The writing of SCI papers needs a team to complete. The first author is naturally the person who contributes a lot to the article, followed by the second author and the third author. Each ranking can play a corresponding role, but it may be slightly weaker than the previous ranking. In addition, relevance plays different roles for different purposes. The weight of the first author is the most convincing. For example, in the evaluation of professional titles, the first author is more effective, while the second author and the third author are slightly worse. Besides the first author, the second author and the third author, the correspondent is the person in charge of the whole article and the most effective post. Generally, communication authors and first authors are often used when promoting professional titles.