If liver cancer has metastasized to lungs after liver cancer surgery, one should go to the hospital as soon as possible to get a clear picture of the specific situation and take therapeutic measures, such as targeted drug therapy or interventional surgery. If metastasis to lungs is found after liver cancer surgery, it means that it has already reached the advanced stage. At this time, it is necessary to treat both the liver cancer at the primary site and the malignant tumor that has metastasized to lungs at the same time, but the specific treatment should be based on the size and distribution of the tumor: 1. 1. Small cancer foci with small distribution: for small cancer foci with small distribution, the symptoms may not be obvious, so it can be treated by radiofrequency ablation and interventional surgery, which are easy to operate and have less side effects. 2. Large and widely distributed cancer foci: if the cancer foci are found to be large and widely distributed, patients will often have symptoms such as chest pain, pleural effusion and dyspnea, etc. After the cause of the cancer is clearly identified, chemotherapy, radiotherapy and targeted drugs such as erlotinib and afatinib can be used to control the spreading of the cancer cells. The specific use of which treatment plan should also be based on the patient’s own condition, liver and lung condition, tumor condition and the doctor’s guidance as the standard.