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分析辽宁省丹东市一起新型冠状病毒肺炎（新冠肺炎）家庭聚集性疫情，追踪疫情的传染源。应用现场流行病学方法调查辽宁省丹东市一起新冠肺炎家庭聚集性疫情中的病例及密切接触者，对调查资料及数据进行描述性分析，对病例及密切接触者的样本采用实时荧光定量RT-PCR法进行新型冠状病毒核酸检测，同时结合血清特异性抗体检测。报告疫情中涉及确诊病例3例，无症状感染者2例，家庭内密切接触者累计34人，其中8人为外省探亲人员，1人与确诊病例同航班，抗体IgG为阳性。本次家庭聚集性疫情是由外省途经武汉来到本地探访亲友的既往感染者引起的家庭聚集疫情。“,”To Track the source of the infection through an investigation of a clustering of coronavirus disease 2019(COVID-19), and provide scientific basis and Strategy for the effective control of the aggregated epidemic situation of COVID-19. Field epidemiological method was used to survey the cases and related close contacts in a family clustering epidemic of COVID-19 in Dandong city of Liaoning Province. We obtained survey data for a descriptive analysis.Real time RT-PCR technique was used to detect 2019-nCoV nucleic acid in samples collected from cases and related close contacts combined with serum specific antibody detection. A total of 3 confirmed cases and 2 asymptomatic infection cases were discovered in the clustering epidemic, with 34 close contacts.Of eight close family contacts visiting from other province, one patient was on the same flight as the confirmed case, and her antibody IgG was positive. The family clustering was caused by past infection case who visited her friend through Wuhan from other provinces to local area.