The waterway of sea-crossing bridge area is a typical restricted area for ship navigation,and the collision safety risk of ship and bridge is high,so the research and development of intelligent navigation aid technology will help to improve the safety guarantee level of waterway in bridge area.Based on the analysis of navigation risk factors and hydrometeorological distribution law in the bridge area,the waters are divided into early warning,warning and waterway blocks according to navigation rules,and the dynamic domain risk identification model of ships sailing in bridge area is constructed.An intelligent navigation aid system for collision avoidance of bridge waterway ships is developed,which can automatically detect ship dynamics and broadcast anti-collision early warning information to the ship,as well as automatically manage and operate software and hardware facilities.The application of the system in Pingtan Strait Bridge waterway in Fujian Province has improved the safety situation of the bridge area waterway.