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目的:分析并比较北京市新发地疫情中新型冠状病毒肺炎（COVID-19）确诊病例与无症状感染者的流行病学特征。方法:收集并整理传染病报告信息管理系统中北京市新发地疫情中COVID-19感染者数据和流行病学调查报告资料，应用SPSS 19.0 软件分析并比较确诊病例和无症状感染者的流行病学特征。结果:2020年6月11日至7月10日北京市共诊断新型冠状病毒感染者368例，其中确诊病例335例（91.03%），无症状感染者33例（8.97%）。病例分布于11个区，其中丰台区病例数占总病例数的68.48%（252/368）。发病曲线呈现暴发流行模式，发病高峰为6月13日。全部感染者年龄n M（n Qn R）为43（31~51）岁，无症状感染者的年龄n M（n Qn R）为32（29~49）岁，低于确诊病例的年龄n M（n Qn R）［43（31~52）岁］，差异有统计学意义（n Z=2.416，n P=0.016）。感染者男女性别比1.26∶1。从事餐饮及商业服务和公共场所服务的人员最多，占64.13%（236/368）。73.91%（272/368）的感染者有新发地直接暴露史。通过核酸筛查发现全部感染者的54.08%（199/368）。确诊病例中轻型和普通型病例占99.10%（332/335），无死亡病例。n 结论:北京市新发地疫情呈暴发流行模式，COVID-19病例以餐饮和服务业人员为主。无症状感染者的年龄低于确诊病例。“,”Objective:To understand the epidemiological characteristics of COVID-19 cases, including asymptomatic cases and symptomatic cases, in the outbreak in Xinfadi market in Beijing.Methods:Data and epidemiological survey reports of COVID-19 cases in Xinfadi market in Beijing were extracted from China's Infectious Disease Information System. Epidemiological characteristics of symptomatic cases and asymptomatic cases were analyzed and compared by using software SPSS 19.0.Results:From June 11 to July 10, 2020, a total of 368 laboratory-confirmed COVID-19 cases reported in the outbreak in Xinfadi market, in which, 335 (91.03%) were symptomatic and 33 (8.97%) were asymptomatic. The cases were distributed in 11 districts, and most cases (252/368, 68.48%) were reported in Fengtai district. The incidence curve of the cases showed a typical outbreak pattern, the case number peaked on 13 June. The median age of the cases were 43 years (n Qn R: 31-51). The asymptomatic cases (n M=32, n Qn R: 29-46) were younger than the symptomatic cases (n M=43, n Qn R: 31-52), the difference was significant (n Z=2.416, n P=0.016). The ratio of male to female was 1.26∶1. Most cases (236/368, 64.13%) were engaged in catering service and public place service. About 73.91% of the cases (272/368) had direct exposures in Xinfadi market. About 54.08%(199/368) of cases were detected through nucleic acid testing and screening. Mild and moderate cases accounted for 99.10% (332/335) of the total cases, and no death occurred.n Conclusion:The COVID-19 cases in the outbreak in Xinfadi market were mainly engaged in catering service and public place service. The asymptomatic cases were younger than the symptomatic cases.