突发性公共事件是指超越常规的、突然发生、可能危害公共安全的、需要立即处理的事件。针对此类事件给当事人所带来的不可忽视的心理影响,本文提出构建预防性“医学-心理-社会”多维系统化的综合危机干预模式是当务之急。本文以“天津爆炸事件”为例,说明突发性公共事件应对的心理危机干预机制。 A sudden public event is an event that goes beyond the normal, sudden, and potentially harmful to public safety and needs to be dealt with immediately. In view of the psychological impact that such events bring to the parties, this paper proposes that it is imperative to construct a comprehensive multi-dimensional and systematic intervention mode of prevention based on the preventive medicine-psychology-society. This paper takes “Tianjin Bombing Incident” as an example to illustrate the mechanism of psychological crisis intervention in dealing with unexpected public events.