船舶定线制,是指定船舶在水上某些区域航行时所遵循或采取的航线、航路或通航分道的一种制度,是对水上交通繁忙区域实施有效安全管理的主要手段,是对航路合理规划、有效利用的重要方法。它代表着水上船舶航行秩序管理的发展方向,目前已在全球不同水域得到成功的应用。长江下游江苏段主航道全长360km,沿江有10个一类开放港口, The ship alignment system is a system that specifies the routes, routes or navigable lanes to be followed or taken by ships in certain areas on water. It is the primary means of implementing effective and safe management of busy water traffic areas, Planning, effective use of important methods. It represents the development direction of the maritime navigation order management and has been successfully applied in different waters of the world at present. The main navigation channel of Jiangsu section of the lower reaches of the Yangtze River is 360km in length with 10 first-class open ports along the Yangtze River.