本文以心理学“认知-情绪-行为”的个人行为意愿为研究框架，研究公众对群体性事件的认知、情绪及行为，深入探索个体参与群体性事件参影响因素。2022年上海市新冠肺炎疫情防控期间，G社区因抗疫管理不善、发布不合理隔离解除公告、毗邻小学强行征收为方舱医院等因素使居民不满情绪裂变，并引发群体性事件。本文对上海市G社区居民群体进行实证分析，力求“窥一斑而见全豹”揭示社会公平感和主观满意度负向显著影响公众个体的群体性事件参与意愿；集体效能感和愤怒情绪正向显著影响公众个体的群体性事件参与意愿。基于此，协助当地政府部门与工作人员厘清影响群体性事件发生的因素，降低群体性事件发生的概率，并从政府、公民维度提出预防与应对突发群体性事件的相关对策建议，从而化解社会稳定风险，确保社会稳定和谐。

In this paper, the psychological "cognitive-emotion-behavior" of individual behavior intention as the research framework, to study the public's cognition, emotion and behavior of mass events, in-depth exploration of individual participation in mass events. In 2022, during the COVID-19 prevention and control period in Shanghai, G community, due to poor management of the epidemic, unreasonable announcement of the removal of quarantine, and forced imposition of makeshift hospitals on neighboring primary schools, caused residents' discontent and mass incidents. This paper makes an empirical analysis of the residents of G community in Shanghai, and tries to reveal that the sense of social justice and subjective satisfaction have a significant negative impact on the willingness of individuals to participate in mass incidents. Collective efficacy and anger positively influence individual participation in group events. Based on this, we will assist local government departments and staff to clarify the factors affecting the occurrence of mass incidents, reduce the probability of mass incidents, and put forward relevant countermeasures and suggestions from the dimension of government and citizens to prevent and deal with sudden mass incidents, so as to defuse the risk of social stability and ensure social stability and harmony.