Based on the micro-blog data of genetically modified food events and using ground theory methods，PADM theory，HSM theory and coping behavior theory，this paper develops a model to explain the characteristics，rules，and the formation mechanism of consumers' coping behavior. The results indicate that consumers' cognition of genetically modified food events are influenced by attributes of harm，information sources and event responses. Consumers with defense motivation and high level of conformity tend to employ the heuristic processing mode. They directly make decisions and choose coping behaviors without analyzing carefully；Consumers with accuracy motivation and high level of knowledge tend to employ the systematic processing mode. Consumers form three core perceptions-risk perceptions，stakeholder perceptions and protective action perceptions based on event situations，and then choose specific coping behaviors through carefully decision-making process. The findings are of great significance to the improvement of risk communication and the guidance of consumers' reasonable coping behaviors.