Lung cancer is a very common malignant tumor of the respiratory system. Lung cancer has a certain relationship with heredity, but the probability is not large, and it does not necessarily mean that children will have lung cancer if their parents have lung cancer. The occurrence of lung cancer is also related to environmental pollution, smoking and genetic mutation, etc. Generally, people with regular health checkups, family history of lung cancer or smoking history need to have annual lung CT scan and further enhanced CT if occupying lung lesions are found, and if lung cancer is considered, percutaneous lung aspiration biopsy is needed to clarify the nature. Generally, for early stage lung cancer or carcinoma in situ, the effect of radical surgery is very good, and prevention and regular medical checkups are important.