Performance of China's journals indexed in SCIE: An evaluation based on megajournal metrics.

The Chinese government has issued a series of policies and measures in recent years to enhance the international impact of its academic journals. This study aimed to evaluate the effect of such support measures on the overall performance of China's Science Citation Index Expanded (SCIE)‐indexed journals. We aggregated China's SCIE journals together into a virtual, multi‐disciplinary 'megajournal', which we call Mega China. Based on Journal Citation Reports from 2015 to 2019, we compared Mega China with the two largest real megajournals, Scientific Reports and PLoS ONE, in terms of journal output and citation performance. The number of SCIE‐indexed journals in China and their impact factors have increased continuously every year. The total citations and h‐index of Mega China reached 489,036 and 247 in 2019, respectively. The immediacy index and impact factor of Mega China have gradually increased, in contrast to those of Scientific Reports and PLoS ONE, and reached 0.735 and 2.601, respectively, in 2019. Our analysis, by viewing all China's SCIE journals as one megajournal, provides evidence that their performance has improved under the Chinese government's new policies. Further improving China's academic journals will require fundamental reforms of the traditional Chinese publishing system. [ABSTRACT FROM AUTHOR]