Abstract: This paper focuses on typical cases of major public health emergencies, integrates emotion feedback theory, Person-situation Interaction hypothesis, and a four-stage life-cycle model of crisis management to construct a conceptual model, and uses a vector autoregressive model and impulse response function to analyze the dynamic mechanisms of personality traits of netizens on emotions and information sharing behavior in different life-cycles of EID online public opinion. Experimental results show that personality traits dynamically moderate the relationship between emotions and information sharing behavior. During buildup, breakout, and abatement stages, high neuroticism has a positive and short-term moderating effect on the relationship between fear and information sharing behavior. During breakout and abatement stages, high extroversion has a positive and short-term moderating effect on the relationship between fear and information sharing behavior. In each of the four stages, openness and agreeableness have different moderating effects, which would amplify information sharing behavior to varying degrees.

Key words: Public’s opinion of emerging infectious diseases, Emotions, Personality traits, Information Sharing behavior, Dynamic effects