Abstract： Objective:To investigate the incidence and the related risk factors of pulmonary bullae in divers.Methods:A total of 132 divers and 98 non-diving personnel were selected from a unit. According to chest CT and X-ray results，pulmonary bullae were diagnosed. The smoking history，diving experience，age，COVID-19 history within three months，and pneumonia history were collected and statistically analyzed.Results:There was no case of pulmonary bullae found by chest X-ray. The CT scan diagnosed 11 divers（8.33%）and five non-diving personnel（5.10%）with pulmonary bullae. Engaging in diving over 10 years is a risk factor for pulmonary bullae in divers；while age over 30 years is a risk factor for developing pulmonary bullae in non-diving personnel.Conclusion:Engaging in diving over 10 years and age over 30 years are the risk factors for developing pulmonary bullae. Therefore，it is necessary to include chest CT as a pulmonary disease screening into the diver selection and annual health examination，so as to improve the detection rate of pulmonary bullae.