Lung ground glass nodule of 7mm, finally examined belongs to carcinoma in situ, which is the earliest condition of malignant tumor in the lung, and the main treatment options include surgical resection, radiotherapy and targeted therapy. 1. Surgical resection: in general, most of the carcinoma in situ only requires segmental resection, wedge resection or sub-segmental resection, which is related to the location of specific lesions. 2. Radiotherapy: for carcinoma in situ with low cell differentiation and high malignancy, radiotherapy can be assisted after surgical resection, and commonly used chemotherapeutic drugs include cisplatin and so on. 3. Targeted therapy: if there is gene mutation through genotype detection after surgery, targeted therapy can be carried out, and commonly used drugs include erlotinib. Lung carcinoma in situ should be treated with surgery as early as possible to prevent the progression of the disease, and after surgery, it is necessary to pay attention to diet regulation, strengthen exercise, enhance physical fitness, and have regular review under the guidance of clinicians.