Lung cancer stage IV can prolong life and improve quality of life after active treatment, but it is generally difficult to cure. Specifically, the appropriate treatment should be chosen according to the condition of lesions and metastases. Stage 4 lung cancer belongs to the advanced stage of lung cancer and may have distant metastases such as intrapulmonary metastases, liver metastases and bone metastases, which need to be treated according to the primary lesions and metastases. Generally stage 4 lung cancer needs systemic treatment, such as chemotherapy, targeted drug therapy, immunotherapy and so on. If oligometastasis occurs, it can be combined with local treatment, such as radiotherapy or surgery. If bone metastasis occurs, radiotherapy and bisphosphonate treatment can be given to the site of bone metastasis to inhibit bone destruction and prevent pathological fracture. In daily life, lung cancer patients need to take more rest, can have appropriate activities, prohibit smoking, adjust dietary habits, eat more vegetables and fruits, lean meat, fish, eggs and other high-protein substances.