The metastatic route and metastatic site are related to the site of the primary tumor. For example, lung cancer, breast cancer and skin cancer mainly metastasize through blood stream, and are prone to form multiple metastatic cancers in the brain, which are often rapidly fatal without treatment. Digestive tract cancer tumors are more likely to metastasize through the lymphatic system and spread to the meninges. Patients with intracranial metastases should not only actively carry out treatment, but also pay attention to diet in daily life. The primary care of brain metastasis of lung cancer is dietary conditioning: while controlling their headache, nausea and vomiting symptoms, patients should improve their dietary symptoms in a timely and effective manner, encourage them to consume more high-calorie, high-protein, high-vitamin, light and easy-to-digest foods, such as tofu and fish soup, milk, red dates and silver ear soup, red bean and lotus seed soup, apples, oranges, grapefruit, grapes, etc., and eat less and more meals to enhance their physical fitness and resistance, so as to reduce complications and control the spread and metastasis of cancer cells.