The comprehensive impact factor (U-JIF) refers to the ratio of the total number of citable documents published in the first two years of the journal to the total number of citable documents published in the first two years of the journal. The calculation formula is: U-JIF= the total number of citable documents published in the first two years of journals cited by composite statistical sources in a statistical year/the total number of citable documents published in the first two years of journals.

The comprehensive impact factor means that the comprehensive impact factor is calculated based on the comprehensive statistical source documents of journals, doctoral dissertations and conference papers.

The comprehensive impact factor refers to the comprehensive impact factor, mainly refers to the integration of arts and sciences, which is calculated based on the comprehensive statistical source literature of scientific and technological journals and humanities and social sciences journals.

Specific objectives of CNKI project of China HowNet.

Integrate knowledge and information resources on a large scale to improve the overall integration and value-added utilization value of resources. Build a service platform for Internet diffusion and value-added knowledge resources to provide information conditions for the whole society to share resources, digital learning and knowledge innovation.

Build a platform for the in-depth development and utilization of knowledge resources, and provide information means for knowledge management and knowledge service for all sectors of society. The fourth is to create a market environment and commercial mechanism for the production and publishing departments of knowledge resources.