Liver cysts are a relatively common benign disease of the liver, and the majority of liver cysts are congenital, that is, they are formed due to some congenital developmental abnormality. Most of the causes of liver cysts are due to developmental disorders of small intrahepatic bile ducts, and solitary liver cysts occur due to ectopic bile ducts. Acquired factors are rare, for example, in pastoral areas, if people are infected with encapsulated cysticercosis, parasitic cysts are produced in the liver. Trauma, inflammation, and even tumors can also cause liver cysts. Cysts can be single, just one, as small as 0.2 cm, or as many as ten or dozens, or even one as large as tens of centimeters. Patients with polycystic liver cysts are sometimes combined with cysts of other internal organs, such as concomitant renal cysts, pulmonary cysts and occasionally pancreatic cysts and splenic cysts. In polycystic liver, the cysts may cover the liver. The clinical manifestations vary with the location, size and number of cysts, as well as the presence or absence of compression of adjacent organs and complications. Liver cysts are usually asymptomatic. When the cyst grows to a certain extent, it may compress the gastrointestinal tract and cause symptoms, such as epigastric discomfort and fullness; common complications of liver cysts are rupture and bleeding, bacterial infection, fistula and penetration, but rarely cancer. With the development and popularity of diagnostic imaging, especially ultrasound has been listed as one of the routine physical examinations of the population, and the detection rate of ultrasound for liver cysts can reach 98%, so many of them are found. However, in the comprehensive understanding of the size, number and location of the cysts as well as the liver and related organs around the liver, especially for patients with huge liver cysts requiring surgical treatment, CT examination is obviously better than B ultrasound for the guidance of surgery. Sometimes some blood tests are still necessary for differential diagnosis, especially the blood alpha-fetoprotein test to exclude primary hepatocellular carcinoma. A liver cyst will neither affect liver function nor develop into liver cancer, so a relatively small cyst is usually left alone and should be reviewed regularly. However, if it grows too big, it may cause indigestion, nausea, vomiting and discomfort or pain in the right upper abdomen, etc. The following treatment methods can be used: ultrasound-guided puncture and drainage followed by injection of anhydrous alcohol to harden the cyst wall. Minimally invasive surgery can also be performed under laparoscopy to open the window to drain and remove the cyst wall, which is more satisfying and less invasive, and the patient recovers quickly and can go down the same day and eat normally the next day.