Lung cancer is the most common cancer in China. Most of the clinical patients are found to be in late stage in time, and they often have hemoptysis, intractable cough and other symptoms that can only be found in the clinic, and the discovery is in late stage. In addition to chemotherapy and radiotherapy, the better treatment means is targeted therapy, but the indications of targeted therapy are very narrow, and the overall prognosis of patients is poor, and it cannot save the patients’ lives. In fact, if the high-risk group can check the low-dose chest CT every year, they can find the suspicious nodules in the lungs at an early stage, early detection, follow-up and timely treatment, the treatment of lung cancer can be advanced as a whole, and the early surgery can save more lives, and with the development of idle surgical techniques and the wide application of thoracoscopy, the pain of the surgery of the patients can be reduced significantly. People over 40 years old, smokers or people with family history of lung cancer, and people with occupational exposure should routinely undergo low-dose thoracic CT examination, which is of great significance. What kind of nodules are more likely to be malignant? At present, the malignancy of nodules located in the outer bands of the lungs, upper lungs, and ground-glass nodules (less than 8 mm) is more likely to be malignant. With the development of lung CT reconstruction technology, the possibility of malignancy of a nodule is significantly increased by vascular reconstruction, if there is a clear relationship between the nodule and the blood vessels. Lung nodules found should be followed up once every 3 months to half a year, and if there are any changes, timely resection is able to eradicate lung cancer.