The presence of ground glass nodules in the lungs requires a comprehensive judgment based on the size and nature of the nodules, which are classified as ground glass nodules, partially solid nodules and solid nodules. If the ground glass nodule is <5 mm, it is mostly a benign chronic inflammatory nodule. If there are no clinical symptoms, no special treatment is needed, and dynamic follow-up with high-resolution CT of the chest once a year is sufficient. If the ground glass nodule is between 6-8 mm, especially if it is larger than 8 mm or more, with changes such as short burr, lobulated, pleural traction sign, pleural depression sign, etc., the possibility of early lung cancer in this ground glass nodule needs to be alerted. Further enhanced CT examination of the chest and percutaneous lung aspiration cytologic biopsy should be given if necessary. If the diagnosis of lung cancer is confirmed, a thoracic surgeon can be asked to remove the lesion at an early stage to avoid missed diagnosis and misdiagnosis. Therefore, pulmonary ground glass nodules require dynamic follow-up with high-resolution CT of the chest for further appropriate measures.