[目的]为了解该校甲肝暴发的原因,分析流行因素,为制订预防控制措施提供依据。[方法]对每一病例进行个案调查。[结果]此次暴发水源受到污染。[结论]加强对学校生活饮用水、公共场所的消毒和甲肝防病知识的宣传,提高甲肝疫苗的接种率是控制甲肝暴发的有效措施。 [Objective] To understand the causes of hepatitis A outbreak in this school and to analyze the epidemic factors and provide the basis for the formulation of prevention and control measures. [Method] Carry on the case investigation to each case. [Result] The outbreak of water pollution. [Conclusion] It is an effective measure to control the outbreak of hepatitis A to strengthen the publicity on the knowledge of disinfection of school drinking water and public places and the prevention knowledge of hepatitis A, and to increase the vaccination rate of hepatitis A vaccine.