Lung cancer with brain metastases as the primary clinical manifestation is not rare, and the metastases can involve the brain, cerebellum, brain stem and other parts. According to statistics, brain metastasis of lung cancer accounts for about 4%-10% of intracranial tumors, and is the most common among all kinds of brain metastases, accounting for about 1/4-1/2, which is much higher than the incidence of brain metastasis of other cancers such as breast cancer, prostate cancer, rectal cancer and stomach cancer. Lung cancer brain metastasis is one of the important causes of death for lung cancer patients, and the 1-year survival rate is only about 10%, and it is also one of the reasons that seriously affect the quality of life of lung cancer patients. Brain metastasis from lung cancer is most common in adenocarcinoma, followed by small cell carcinoma. Yao Shuyang, Department of Thoracic Surgery, Xuanwu Hospital, Capital Medical University