Abstract: Objective To investigate epidemiological characteristics of cluster outbreak caused by COVID-19 in Neijiang City. Methods According to the case epidemiological investigation plan from the COVID-19 prevention and control scheme （Fifth Edition） of the National Health Committee and using retrospective survey method, data were collected and descriptively analyzed by referring to medical records and combining with field epidemiological investigation. Results Six cluster outbreaks occurred from January 24 to February 11 in Neijiang City, with 18 confirmed cases and 261 exposed persons. The average attack rate was 6. 90%. Of the 6 outbreaks, 5 were family clusters and one occurred in a public place （teahouse）. Three clusters were intergenerational, with a median incubation period of 7. 5 days. Of all the cases, 44. 45% had fever as the first symptom, 44. 45% had dry cough, and 88. 89% had chest CT findings of COVID-19. Conclusion The outbreaks of COVID-19 occurring in Neijiang were mainly caused by the family gatherings. It should be emphasized to take measures for self-protection and isolation, avoid social activities such as family gatherings, so as to reduce the risk of COVID-19 outbreaks.