If lung cancer brain metastases are not treated, the natural survival of patients is about half a month to a year. Especially for multiple diffuse brain metastases or single metastases that are relatively large and cause clear cranial hypertension and cerebral edema will quickly lead to the death of the patient. The main causes of death are cerebral edema, brain herniation formation and secondary respiratory, cardiac and circulatory arrest. For lung cancer brain metastasis, treatment means such as radiotherapy, chemotherapy or targeted therapy can be adopted at present. As long as the patient’s physical condition can tolerate it, lung cancer that has already occurred brain metastasis can be actively treated. As long as the patient’s physical condition can tolerate it, lung cancer with brain metastasis can be treated actively.