One of the therapeutic approaches in acute liver failure is the use of an artificial system replacing hepatic function--bioartificial liver. Its application is the most perspective in fulminant liver failure during preparation for transplantation of the liver (so-called bridge to transplantation) or in case of a non-functioning hepatic graft, and to reduce the mortality and morbidity of patients with acute liver failure where transplantation is not indicated or where a suitable graft was not found. The authors discuss briefly the construction of these systems, analyze different indications of treatment and its results, obscure questions and perspectives of further development.