[Purpose/significance] "Event" is the core concept of human social activities and the key element of intelli⁃ gence activities. With the development of machine learning, big data, artificial intelligence and other emerging technol⁃ ogies, a new technology with event as the research object, named "Event Evolution Graph" (EEG), comes into being. This paper sorts out and summarizes the research advance of the EEG, so as to provide reference for the research and application of this technology. [Method/process] The concept, research status and key technologies of the EEG were investigated, analyzed and summarized based on literature research. Firstly, this paper introduces the basic concept and research status. Then, the overall technical framework is summarized and the key technologies related are dis⁃ cussed in detail. Finally, the challenges faced and future prospects of the EEG are proposed. [Result/conclusion] At present, information science research is gradually changing from static object to dynamic object knowledge manage⁃ ment with event as the core. Since it was first proposed in 2017, the EEG has gradually attracted extensive attention from academia and the industry, and has achieved application results in various fields, which will provide strong techni⁃ cal support for the research of information science in the future.