When cysts are found in liver after colon cancer surgery, it is necessary to differentiate them from simple cysts, polycystic liver disease or hepatic cysticercosis, and then choose conservative treatment or surgical treatment according to the cause of disease. 1. Simple cysts: If simple cysts are found after surgery for colon cancer, no special treatment can be done when there is no symptom; if they are bigger cysts, direct surgery is enough. 2. Polycystic liver disease: If liver cysts caused by colon cancer after surgery belong to polycystic liver disease, growth inhibitor analogs and ursodeoxycholic acid should be taken in time. If necessary, cyst aspiration or opening and resection should be performed. 3. Hepatic cysts: if liver cysts are caused by hepatic cysts after colon cancer surgery, oral anthelmintic should be taken, and surgery should be considered as soon as possible. If cysts are found in liver after colon cancer surgery, regular review is needed to know the size and nature of cysts and standardized treatment should be given in time.