Hepatic cyst puncture examination found brown fluid, may be accompanied by old hemorrhage or infection in the capsule due to, should promptly do further examination to determine the cause of the disease. Most hepatic cysts are simple, slow-growing, and mostly without clinical symptoms. It is generally believed that they are caused by the developmental disorders of the intrahepatic bile ducts and lymphatic ducts in the embryo. The cysts have a complete envelope and the cystic fluid is usually clear and transparent. Usually, there are no clinical symptoms and no special treatment is needed. However, when liver cysts increase in size, they are prone to symptoms of compression of the surrounding organs and need to be drained by puncture of the liver cyst. If the cyst ruptures and bleeds, brown fluid is formed after the oxidation of iron in the blood by oxygen. If the fluid in the cyst has been infected, the fluid may also appear brown after improvement. Patients should rest after cyst drainage, eat more easy-to-digest food and fresh fruits and vegetables, and be treated with anti-infective, hemostatic or surgical treatment if necessary.