Abstract: Taking the online public opinion spurred by the Gansu Mountain Marathon accident as an example, this present paper studies the driving factors, evolution mechanism and response strategies of online public opinion on sports event crisis. The study concludes that the factors influencing the evolution of online public opinion on sports event crisis include subject factor, carrier factor and object factor. The subject factor influences the dynamic changes of the evolution of online public opinion through netizens and their attention, media and their attention, opinion leaders and their mobilization ability, parties and their traction power, and government and its regulation ability; the carrier of online public opinion influences the diffusion size of online public opinion in cyberspace through the audience of the platform carrier; the object of online public opinion drives the evolution of online public opinion on sports event crisis through the impact of the event. Based on the interests of government, media, opinion leaders and sports event enterprises, we propose the strategies to stop the evolution of online public opinion on sports event crisis in order to ensure the safety of sports events and achieve high-quality development of sports industry.