Lung cancer brain hemisphere multiple metastases life expectancy is unpredictable. Multiple metastases in the brain hemisphere of lung cancer suggests that the cancer is in advanced stage, and chemotherapy, targeted therapy and radiotherapy are feasible when conditions permit. Some lung cancers are more sensitive to chemotherapy, and the lumps will shrink or even disappear after chemotherapy treatment, and then the lumps will be stable after regular review, and the survival time is relatively long. For brain metastasis of lung cancer, according to the location, size and shape of the tumor, the contraindications of radiotherapy can be excluded and corresponding radiotherapy plan can be made. If there are conditions, even targeted therapy or targeted combined radiotherapy can be carried out. Lung cancer brain metastasis, if the treatment is effective, the survival life will be longer. If the treatment is ineffective or there are many underlying diseases, the survival time will be shorter. The specific life expectancy varies from person to person.