In phaseⅠ(Taicang to Nantong section)of 12.5 m deep-water channel project from Nanjing in the Yangtze River,to achieve the goal of “curbing adverse trends and improving channel conditions”,we carried out riverbed evolution analysis,mathematical model calculation and physical model test and determined the regulation scheme at last.Based on a multi-program comparison,we chose the flexible mattress,riprap embankment and component embankment as the engineering measures,and developed a new beach protection structure,i.e. the active hook, and applied it to the project.