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The unit marked with a is the first unit, or the unit appearing in front is the first unit, which has little to do with the first author and correspondent author, that is to say, the unit that will rank first by default is the first signature unit. In the publication of SCI papers, the author's signature is very important, which is directly related to the author's vital interests. The signature of SCI papers has been puzzling many authors.

But in fact, the signatures of papers should be sorted according to the author's contribution to the papers, but the actual situation is often very complicated, and the first unit is very important in the publication of SCI papers.

Many researchers, especially those in cooperative research, often encounter the problem of the first signature unit when publishing their papers. Taking doctoral students as an example, many colleges and universities stipulate that "doctoral students are the first author" and "the school where doctoral students work is the first unit", and some teams even require "doctoral tutors to be communication authors".

When evaluating the achievements of scientific researchers, many units often only admit articles that "the first author and the first signature unit are their own units" or (and) "the first signature unit of the correspondent is their own units".

Entrusted by the Ministry of Science and Technology, China Institute of Science and Technology Information is responsible for the statistics and analysis of scientific papers in China. Since 1988, the statistical results have been released to the outside world, providing statistical data services for domestic scientific research units, which are widely used in scientific and technological management departments and academia.

The statistical principle of the research institute on the attribution of papers is based on the "first unit of the first author" marked when the papers are published. This makes the first signature unit of academic papers very important.

Generally speaking, the signature of "author unit" should be the name of the unit that mainly completes the paper work. "Author unit" is an important element of the paper, so it is necessary to objectively record the units that have made substantial contributions to the paper and rank them according to their contributions. When the author's unit changes, the current unit is not necessarily the institution that contributes the most to the paper.