The full name of CPCI is Index of Proceedings of Scientific and Technological Conferences, so it mainly searches conference papers and documents, including monographs, series, preprints, periodicals, reports and other forms of conference documents. If you are the fourth author of papers with high academic value, such as the fourth author of papers in core journals or even the fourth author of international academic papers, the writing process of such papers involves a lot of experiments and data analysis, most of which are in the form of co-authorship. Participating in it shows that the author's scientific research ability is very high, and he can participate in the scientific research of these projects, even if he is not the first author, he can play an obvious role.