The Fujiangsha waterway in plane presents a pattern of branching twice and coexistence of three branches.With complicated topographical conditions and intense local channel evolution,it is one of the key sections of the 12.5 m deepwater channel of the Yangtze River below Nanjing.In order to demonstrate the effect of Fujiangsha waterway regulation project after its implementation,based on the measured topographic and hydrological data,the evolution of beach and trough,the adjustment of branching ratio,the effect of beach consolidation and the improvement of waterway conditions before and after the implementation of Fujiangsha waterway regulation project in the 12.5 m deepwater channel below Nanjing of the Yangtze River are systematically compared.The results show that the Fujiangsha waterway regulation program is feasible in general,and the regulation effect is achieved as expected.However,attention should be paid to the effect of bottom sediment movement along the Jingjiang River on siltation of the Fubei waterway.