Primary liver cancer is known as the king of cancers due to its difficulty in detection and rapid progression and poor treatment outcome, with a median survival of about 6 months. The most common extrahepatic metastasis of liver cancer is lung metastasis, which accounts for about 40-53% and has poor overall prognosis. Survival after lung metastasis is as follows: 1. Lung metastasis of hepatocellular carcinoma is already in advanced stage, which is more difficult to treat. If the primary lesion and lung metastasis are both isolated lesions, they can be surgically removed, which can help prolong survival and improve prognosis, but the incidence of surgical complications is high; in addition, local ablation of lung metastases can be considered. 2. If the patient’s general condition and liver function are good, although there is no surgical removal If the patient’s general condition and liver function are good, although there is no chance of surgical resection, the survival can be prolonged through systemic chemotherapy, immunotherapy, molecular targeted therapy and other comprehensive treatments. 3.