Based on the measured data，the evolution characteristics and activities of deep pools in the Xuliujing reach of the lower reaches of the Yangtze River are analyzed.The results show that before 2003，the lowest point of the main trough was generally within -40 m，and there was no obvious deep pool.After 2003，under the influence of the construction of Sutong Bridge and other projects，deep pools below -40 m appeared.Since then，with the reduction of upstream sand and the implementation of the regulation project of Xuliujing node on both banks，the deep pool has been scoured to about -50 m after 2007 and below -70 m by 2020.Relevant research shows that the impact range of bridge works on hydrodynamic forces and riverbed scouring and silting is generally 5~6 km.In addition，the lower section of Xuliujing River is an extended section with slow flow，and there is no obvious trend of scouring and moving down for deep pools，which will not cause significant impact on the layout of Haitai tunnels downstream.However，considering the development of deep pool flushing，it is necessary to strengthen the monitoring of deep pool changes.