When the liver is cut in half, it can regenerate if the patient does not suffer from cirrhosis; however, for patients with cirrhosis, the regenerative capacity of the liver is weaker after the surgery. 70% of normal human liver tissue may grow back again after being removed because the regenerative ability of the liver is relatively strong. When the liver is removed, the newly grown liver tissue can be restored to its original size to compensate for the liver function, although it is limited to patients who do not have cirrhosis and whose liver function is less impaired. If the patient had cirrhosis before, the regenerated liver tissue cannot fully restore the normal liver cells, and the blood supply as well as the oxygen supply to the liver tissue of this type of patient may be affected, and the regeneration ability will be weakened after the surgery if the liver cells are more severely damaged. After the liver is cut in half, it is recommended to go to the hospital for regular checkups to see how the liver is recovering and to determine whether the liver function can be metabolized normally, and then to treat the patient according to the results of the diagnosis.