Lung cancer belongs to malignant tumors, and its incidence rate ranks first among malignant tumors in China. Lung cancer is mainly categorized into non-small cell lung cancer and small cell lung cancer. Early stage prognosis is better, middle and late stage is relatively worse, especially late stage, which cannot be completely cured clinically, and the five-year survival rate of late stage lung cancer is less than 5%. Nowadays, screening for people with high risk factors for lung cancer can detect early lung cancer and timely surgical resection can significantly improve the five-year survival rate. Therefore, for people with high risk of lung cancer, such as long-term heavy smoking and family history of lung cancer, they should undergo screening related to lung cancer, such as low-dose spiral CT examination.