In this paper, national papers’ cited intensity (NCI), as an index, is defined to reflect the impacts of papers of one country, by referencing the concept about impact factor (IF) of journal. The NCI is calculated on the papers published in Nature and Science between 1991-2014 by Chinese institutions. The findings show that the impacts of papers in Nature and Science by Chinese institutions are elevated continually as a whole. In recent 5 years, the mean NCIs of all papers and the papers that China’s institutions as the first contribution institution, have exceeded the journal’s IF, and have a positive contribution to the journal’s IF. Furthermore, the China’s NCI has also matched to that of USA, UK, Germany, France, Japan, and other developed countries.

Plant self-incompatibility is widely found in flowering plants. It’s an important genetic mechanism to prevent inbreeding and increase the genetic diversity and heterosis of flowering plant. About self-incompatibility mechanism, most of the researches focus on the S gene. In this paper, we use Hiscite, Citespace and VosViewer based on Bibliometrics to analyze self-incompatibility mechanism in the S-locus of plant, and have a brief discussion on protein phosphorylation, S-RNase ubiquitination and the evolution of Arabidopsis. According to the current research status in this field, we also put forward the existing problems and solutions to provide a reference for further study.