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目的:分析北京市不同阶段新型冠状病毒肺炎（新冠肺炎）疫情特征，为今后新冠肺炎及其他新发突发传染病的防控提供参考。方法:收集北京市《全民健康信息化疾病预防控制信息系统》和流行病学调查报告中新冠肺炎确诊病例的人口学、来源、发病时间、就诊时间、确诊时间等信息，分析比较不同阶段的特征。结果:2020年1月19日至7月10日，北京市共报告新冠肺炎确诊病例935例，疫情可分为三个阶段：武汉输入病例为主的境内输入疫情防控阶段（2020年1月19日至2月28日）；多国境外输入疫情防控阶段（2020年2月29日至6月10日）；新发地市场为主的本地聚集性疫情防控阶段（2020年6月11日至7月10日）。第一阶段病例来源主要为本地病例（51.46%）和境内输入病例（48.54%），第二阶段主要为境外输入及其关联病例（97.80%），第三阶段主要为本地病例（99.12%），三个阶段病例来源构成比差异有统计学意义（n x2=1170.680，n P<0.01）。所有病例发病至就诊时间M（Pn 25~Pn 75）为2.00（0~5.00）d，就诊至确诊时间M（Pn 25~Pn 75）为1.00（1.00~2.00）d，发病至确诊时间M（Pn 25~Pn 75）为4.00（2.00~7.00）d。三个阶段病例发病至确诊时间、就诊至确诊时间逐渐缩短，差异有统计学意义（n H=76.833，n P<0.01；n H=204.484，n P<0.01）。n 结论:北京市三个阶段人口学特征、来源、临床特征均不同，需采取不同的防控措施进行精准防控。“,”Objective:To analyze epidemiological characteristics of coronavirus disease 2019 (COVID-19) at different stages in Beijing, so as to provide references for the prevention and control of COVID-19 and other emerging infectious diseases in the future.Methods:The information of confirmed COVID-19 cases from the “China Information System for Disease Control and Prevention” and epidemiological investigation reports. The demographic information, case source, onset time, hospital visit time and diagnosis time were analyzed for the characteristics of epidemics at different stages.Results:From January 19, 2020 to July 10, 2020, 935 of COVID-19 confirmed cases were reported. The epidemics can be divided into three stages, including the prevention and control stage of domestic imported cases mainly from Wuhan (from January 19 to February 28, 2020), the prevention and control stage of importing cases from abroad (from February 29 to June 10, 2020) and the prevention and control stage of local cluster cases mainly from Xinfadi market (from June 11 to July 10, 2020). In the first stage, cases were mainly local cases (51.46%) and domestic imported cases (48.54%). In the second stage, cases were mainly imorted cases from abroad and cases related to such cases (97.80%). In the third stage, cases were mainly local (99.12%). The difference in the proportion distribution of the sources in the three stages was statistically significant (n x2=1170.680, n P<0.01). The median time interval from onset to hospital visit was 2.00 days (Pn 25 - Pn 75: 0-5.00) and the median time interval from hospital visit to confirmed diagnosis was 1.00 day (Pn 25 - Pn 75: 1.00-2.00). The median time interval from onset to confirmed diagnosis was 4.00 days (Pn 25 - Pn 75: 2.00-7.00). The diffenrence in the proportion distribution of the median time intervals at the three stages was statistically significant (n H=76.833, n P<0.01;n H=204.484, n P<0.01).n Conclusions:The demographic characteristics, sources of case and clinical features at the three stages in Beijing were all different. Differential prevention and control measures should be taken for precise prevention and control.