The grinding glass foci in the lower lobe of the right lung need to be judged comprehensively according to the size and nature of the grinding glass foci. Most of the ground glass foci belong to ground glass nodules, if the nodules are less than 5mm, they are mostly benign chronic inflammatory nodular changes without clinical symptoms, and do not require special treatment, and dynamic follow-up chest high-resolution CT once a year is sufficient. If the ground glass foci are between 6-8mm, especially larger than 8mm or more, with lobulated, short burr, pleural traction sign, pleural depression sign and other changes, the possibility of early lung cancer needs to be alerted. Further enhanced CT examination of the chest and percutaneous lung puncture cytologic biopsy if necessary are given to find out whether it is early lung cancer. If early lung cancer is diagnosed, surgical resection of the lesion in thoracic surgery is needed to avoid missed diagnosis and misdiagnosis. Therefore, the presence of ground glass foci in the lower lobe of the right lung requires dynamic follow-up, and if there is a growing nodal change, the possibility of lung cancer should be highly alerted.