Liver cysts are benign lesions mostly caused by congenital factors, growing slowly, mostly without clinical symptoms and found incidentally during physical examination, most of them do not need treatment and can be observed by regular ultrasound or CT. At present, there is no drug that can prevent and treat liver cysts, if the liver cysts are huge, cysts secondary to infection or bleeding, cysts twisting, we have to carry out surgery, there are two main treatment methods: 1. will not grow. 2.Large liver cysts can be operated by “roof removal”, that is, after aspirating the cyst fluid, most of the cyst wall or all the free cyst wall will be removed, just like removing the roof of the house. In addition, liver cyst surgery can also be performed laparoscopically for cyst drainage and cyst excision. Anti-infective treatment should be aggressively performed for cyst secondary infection and surgical treatment should be aggressively performed when conservative treatment for cyst secondary bleeding is ineffective. For giant liver cysts in the left outer lobe of the liver, lobectomy or partial hepatectomy can be performed.