长江口南支水道是一条比较复杂的通海河槽,其河槽开阔,沙洲、边滩、阴沙发育,把整个南支塑造成一个复式河槽。作者根据历史图件资料的分析研究,着重描述了南支水道近期的水下地貌特征,从而作出了工程地貌条件的评价,南支水道地貌形态复杂,但它是一条资源丰富、利用价值极高的黄金河槽。 The South Branch of the Changjiang Estuary is a rather complicated Tonghai River channel. Its river channel is open, its sandbars, side beaches and shade are well developed, and the entire southern branch is shaped into a double channel. Based on the analysis of the historical map data, the author has described the recent underwater geomorphic features of the Nanzhi Watercourse and made the evaluation of the geomorphic conditions. The topography of the Nanzui Watercourse is complex, but it is a resource-rich and extremely valuable Golden channel.