Abstract: 【Purpose/significance】The method based on the affair map reveals network public opinion events, which can accurately analyze the development trend and context of public opinion events, and provide suggestions for the department's public opinion con⁃trol and public opinion guidance.【Method/process】Taking the related topics and comments on Weibo "Long March 5B Out of Con⁃trol" as the research object, the extracted data is cleaned and processed, and the events are extracted and generalized, and the Shuncheng event pair and the causal event are generated respectively Yes, and identify its succession relationship and causality rela⁃tionship, so as to construct a network public opinion affair map.【Result/conclusion】In the development process of online public opin⁃
ion, it can be seen that the evolution path of causal events has the characteristics of short time occurrence and short evolution path. In the process of spreading the Shuncheng incident, it is often accompanied by causal events, and the trend of public opinion events is closely related to the emotions of netizens【. Innovation/limitation】Construct the evolution path of network public opinion based on the event graph, and at the same time reveal the propagation characteristics and practical significance of the evolution of network public opinion. It is necessary to expand the research sample in the follow-up, so that the research results have better generality.