First authors rank first, second authors rank second, third authors rank third. When using paper signatures in the evaluation of professional titles, the power of the first author is more important than that of the second and third authors, but less important than personal signatures, and the scores of the first author, second author and third author of the paper decrease in the ranking order. The first author is generally the researcher who has contributed the most to the work of this paper, not only contributing the most important charts (i.e. physical contributions), but also writing the first draft of the article (i.e. intellectual contributions). The second and third authors sign after the first author in descending order of contribution value. The first author is usually the main executor of specific work, responsible for the main experimental results, and the author of the first draft of the article (that is, the intellectual contribution to this article). The responsibility of the second author is also after that of the first author.