Because of the difference in the connection between any two branches of a commercial bank , there are four kinds of external organization in the commercial bank system , that is single bank system , main - branch bank system , group bank system , and mixed bank system 根據商業銀行分支機構間相互關系的不同,商業銀行外部組織體系分為單一銀行制、總分行制、集團銀行制和混合制。本文第二章著重介紹總分行制。