自杀日趋成为世界各国一个重要的社会问题。自杀的发生与自杀工具的易获性有关。自杀在不同的国家间、城乡间分布不同。自杀有明显的季节性。在中国,服毒自杀最为多见,地点以在家中为主。自杀人群分布具有性别、年龄、职业分布、文化程度、婚姻状况、家庭经济状况和种族特征。目前国际上对自杀采取三级预防模式。 Suicide has increasingly become an important social issue for all countries in the world. The incidence of suicide is related to the accessibility of suicide instruments. Suicide in different countries, different distribution between urban and rural areas. Suicide has obvious seasonal. In China, poisoning suicide is the most common place to home-based. The population of suicides is gender, age, job distribution, educational level, marital status, family economic status and ethnicity. Currently, there are three levels of prevention against suicide in the world.