The appearance of liver metastasis after colon cancer surgery often suggests that the cancer has further progressed. At this time, it is necessary to choose comprehensive treatment including surgical resection, radiotherapy, chemotherapy and targeted therapy according to the specific situation of metastasis. 1. Surgical resection: for single confined lesion in the liver, local resection can be considered. 2. Radiotherapy or chemotherapy: After surgical resection or for some multiple lesions in the liver, radiotherapy or chemotherapy can be considered. 3. Targeted therapy: some targeted drugs are also effective in treating liver metastasis, but the price is generally more expensive. If liver metastasis occurs one year after colon cancer surgery, the specific treatment measures need timely follow-up or medical consultation, and the corresponding effective treatment should be chosen under the guidance of professional doctors.