Abstract: For the sake of studying the mechanism of emotional contagion in a group and control emotional hazards under emergencies, the authors introduced a concept of contact relation according to the actual emotional characteristics, and improved emergency emotional contagion model (SOSPa-SPSOa), so an improved emotional contagion mechanism in a group was presented. Moreover, the authors discussed the situations that different emotional valences appear in a group with the actual emotional characteristics, analyzed the influence of model parameters on the process of emotional contagion by Matlab. The results indicate that an increase in the initial size of the subgroup showing negative emotions could increase the time of emotional contagion in the group, but the increase has only a marginal effect on the final state of emotional balance, that the effect of contact contagion is lower than that of the spontaneous contagion process or the spontaneous recovery process, and that increasing probability of spontaneous recovery can reduce the time of group emotional contagion, which is beneficial to controlling and regulating group emotions.

Key words: group emotion, emotional valence, emotional regulation, infection law, numerical simulation, emotional contagion model