Semicircular annuloplasty was applied to 16 patients with congenital heart diseases with systemic atrioventricular valve regurgitation (congenital MR 4, ECD 4, Fontan 7, BWG 1). This annuloplasty was performed additionally after the conventional valvulocommissuroplasty. Regurgitation disappeared or was reduced in most of the cases and typical improvement was recognized in the congenital MR group. This procedure was able to be performed rapidly and was applicable to the various heart diseases with systemic atrioventricular valve regurgitation.