A. Literature quantity and classified statistics of more than 7,000 academic journals of natural and social sciences officially published in China; B. Citations, citation links and classified statistics of various periodical papers; C. Statistical data on the number of published articles, the number of citations and the author institutions of periodical papers; Statistics of website visits and IP addresses of China HowNet Center.

The above contents are based on the statistical data of 3 1 as of February 2006, and updated every month from the date of operation of this system, which provides a dynamic observation window for the editorial departments of various journals to understand the changes of their social influence and academic influence.

It also provides a set of objective and fair data reference for the comparative evaluation of journals in various disciplines. It is hoped that the information provided by this system will contribute to the overall prosperity and development of academic journals in China. Finally, it should be noted that, in view of the dynamic nature of information, the statistical results of this system are only valid within the statistical scope of CNKI at that time.

There is a 168 digital library with professional themes, and scholars in all fields have their own professional knowledge search engines to help you understand the hot topics of public concern.

Academic resources: comprehensive navigation of academic resources websites

Academic statistical analysis: performance evaluation and statistical analysis of academic documents.

Extended data:

HowNet, the concept of national knowledge infrastructure, was put forward by the World Bank in 1998. CNKI project is an information construction project aimed at realizing the dissemination, enjoyment and value-added utilization of knowledge resources in the whole society. Initiated by Tsinghua University and Tsinghua Tongfang, it was established in June 1999.

On May 20 19, the online learning platform of Scientific Research Integrity and Academic Norms was officially launched in China HowNet.

The "Evaluation and Analysis Database of the Impact of Academic Journals" provides journals with the distribution of disciplines, the distribution of publishing delay and the analysis of content quality, supports the analysis of authors and reviewers' work performance, and helps the editorial department to scientifically adjust the direction of running journals and publishing strategies.

The Analysis Database of Evaluation Indicators of Academic Journals provides decision-making reference for periodical publishing management departments and organizers to analyze and evaluate the layout of academic journals' disciplines and research levels, the characteristics and quality of journals' contents, and the development trends of various journals.