China Management Science is not the core periodical of EI, but it was searched by EI. "China Management Science" is the pearl periodical area of the periodical partition table of the Literature Information Center of China Academy of Sciences. EI core journals refer to engineering journals with high academic quality and influence, which are included in EI database. EI database is one of the most important literature retrieval tools in the global engineering field, including academic journals, conference papers, patents and other information of various engineering disciplines. China Management Science is also the core periodical of CSSCI (Citation Index of Chinese Social Sciences) and RCCSE (Core Academic Journal of China), and can also be retrieved by EI.