Acute kidney injury (AKI) occurs in approximately 25 ~ 50% decompensated liver cirrhosis. Liver cirrhosis with acute kidney injury including non-hepatorenal syndrome (non-HRS) and HRS. The hepatorenal syndrome includes type 1 and type 2. The strategy for managing non-HRS includes treatment of the underlying causes, prevention for infection, and bleeding episodes. The goal of supporting treatment is to maintain hemodynamic stability. Specific therapies for the HRS are vasoconstrictor drugs, albumin, or renal replacement therapy. The mortality of patients with HRS is high. Therefore, understanding the cause of liver cirrhosis with AKI may help us to choose the appropriate therapy for improving prognosis.