Lung cancer is currently the first urban tumor incidence rate, and the incidence rate of lung cancer in Zibo is still very high, which may be related to the serious pollution in our city. It is recommended that we should have at least one annual chest X-ray checkup (10 yuan) for those over 35 years old, and frontal and lateral chest radiographs (100 yuan) or even chest CT (500 yuan) for those who are in a better financial condition. Purpose: Early detection of lung lesions. Early detection and early treatment is the best way to cure lung cancer. If there are elderly people in the family who have lung cancer, their children may have certain genetic predisposition and the chance of developing lung cancer is much higher than normal people, and if there are smoking and passive smoking, it is more important to do chest examination at least once a year.