If liver cancer metastasizes to the lungs one year after surgery, first of all, patients should undergo systemic examination such as CT, PT-CT, etc., to clarify the spreading situation, and then determine whether there are conditions for surgical treatment, and if there are no conditions for surgical treatment, systemic treatments such as radiotherapy, chemotherapy, etc. should be carried out first, so as to control the development of the cancer cells. Compared with benign tumor cells, cancer cells are prone to proliferation. For example, if a patient finds that the cancer cells have metastasized to the lungs one year after liver cancer surgery, he or she needs to undergo a systemic examination to determine the extent of proliferation of the cancer cells, and then the doctor should determine whether surgery can be performed or not. If the extent of proliferation is too large for surgical resection, he or she needs to use systemic treatments, such as radiotherapy, chemotherapy, and targeted therapy, etc., in order to eliminate the cancer cells and create the conditions for surgical resection. If the spread of cancer is too large to be surgically removed, then systemic treatments such as radiotherapy, chemotherapy and targeted therapy should be used first to eliminate the cancer cells as much as possible, so as to create conditions for surgical resection. Although it is difficult to cure the spread of cancer cells, active treatment can still help patients prolong their life and relieve pain. Patients should maintain a positive and optimistic mindset and cooperate with doctors to complete examinations and treatments.