Generally, 9mm ground-glass nodules are more serious and need to be alert to the possibility of malignant nodules, which should be promptly removed by surgery if necessary. The size of ground-glass lung nodules is important for predicting the benign or malignant nature of the nodules. Generally, nodules smaller than 5mm are less likely to be malignant, and it is recommended to review dynamically once a year to observe whether there is a tendency for the nodules to increase in size. For lung nodules of 6~8mm, it is necessary to review and follow up every 3~6 months. For nodules larger than 8mm, the possibility of early lung cancer is higher. If necessary, enhanced CT examination of the chest is needed, and CT-guided lung puncture biopsy or thoracoscopic nodule resection can also be done to clarify the nature of the nodule, and if the pathology suggests that it is malignant, radiotherapy, chemotherapy, etc., may be needed in the follow-up. If a 9-mm ground-glass nodule shows signs of malignant nodules, such as increasing solid components, signs of burrs on the margins, internal lobarization, and pleural tugging, the patient should go to the thoracic surgery department in time for early surgical intervention.