Abstract: 【Purpose/significance】Public events and public opinion can easily cause public panic.The mainstream media can help the public to establish a correct outlook on life and values【. Method/process】First,this article analyzes the life cycle of public events from the four stages of brewing,outbreak,continuation and reduction of public events; Then,it studied the influence of mainstream media guidance on public events and public opinion from various aspects such as information dissemination methods,dissemination content, and public opinion subjects; Finally,based on the generalization of the relationship,the generalization of objects,and the generalization of hotspots in public events,the openness and explosiveness of the information interaction of the generalization of public events,the ran⁃domness and sensitivity of the dissemination of social public opinion,the public The subjectivity and other characteristics of the high⁃lights were explored.【Result/conclusion】 The study found that the generalization of public opinion in public events under the guid⁃ance of mainstream media has three generalization characteristics:point-axis,jump and contagion,and then this article proposes that the control of public opinion can be used to cultivate and establish opinion leaders and improve The social public opinion protection system and the full use of the authority and credibility of mainstream media are suggestions for positively guiding public opinion on public events【. Innovation/limitation】This article analyzes the generalization of public opinion in public events under the guidance of mainstream media and proposes relevant suggestions for improvement.It has certain reference significance for effectively avoiding the adverse effects of public opinion on society.