[目的]对龙岩市华龙社区发生一起腹泻疫情进行调查。[方法]采用现场流行病学调查方法,了解疫情发生情况及可疑的传播因素,并对粪便标本进行检测。[结果]本次共发现腹泻239例,罹患率2.7%。检测粪便标本7份,6份诺如病毒抗原阳性,4份检出诺如病毒核酸片段。疫情符合经水传播特征。[结论]本次疫情为感染诺如病毒而引起一起群体性急性胃肠炎暴发,可疑的传染源为被污染的自备水源水。 [Objective] To investigate a diarrhea epidemic in Hualong community in Longyan City. [Methods] The method of field epidemiology was used to understand the epidemic situation and the suspicious transmission factors, and the stool specimens were detected. [Results] A total of 239 cases of diarrhea were found, the attack rate was 2.7%. Seven fecal samples were tested, six were positive for Norovirus antigen and four were identified as Norovirus nucleic acid fragments. The epidemic is consistent with waterborne characteristics. [Conclusion] The outbreak was caused by the infection of Norovirus and caused a group of acute gastroenteritis outbreaks. The suspicious source of infection was polluted source water.