Gamma Knife can treat brain metastasis of lung cancer. Gamma Knife belongs to a kind of stereotactic radiotherapy, which can be used for local treatment of brain metastasis of lung cancer. Gamma Knife is a common method of stereotactic radiotherapy, which uses focused gamma rays to generate high energy to destroy the lesion, so as to achieve the purpose of treating tumors, and is often used in local treatment of tumors. Lung cancer brain metastases often have symptoms of cranial hypertension such as headache, dizziness, nausea and vomiting because of intracranial space occupation. Surgery, radiotherapy and chemotherapy can be used to treat lung cancer brain metastases to control the disease progression and alleviate the symptoms. Gamma knife belongs to the commonly used stereotactic radiotherapy, which is a kind of radiotherapy and can be applied to the local treatment of lung cancer brain metastasis. Although Gamma Knife can be used for brain metastasis of lung cancer, the ideal indications are that the diameter of the brain metastasis lesion is less than 3 centimeters, there is no serious symptom of cranial hypertension, and the location of the lesion is relatively deep, etc. Gamma Knife itself can cause short-term peritumoral edema, which may aggravate the symptoms. It is recommended that patients under the guidance of specialists to assess the indications and treatment of the disease.