We conduct an analysis of the operational status of navigation structures in the channel regulation project of Luochengzhou section in the lower straight reach of the Yangtze River.Using statistical data from in-situ surveys conducted since the completion of Luochengzhou regulation buildings,combining with analyses of river regime,local sediment dynamics,and hydraulic changes,we investigate the characteristics and trends of buliding damage,and discuss the cause of damage.The results show that the protection project implemented in the Luochengzhou head area effectively reduces the distributary flow ratio of the right branch.However,significant damage occurs to LR1,LR2 spur dike protection mattress and LR1,LR2 bottom protection belt,weakening the flow restriction effect on the right branch.Post-project implementation,the turbulence in the right branch of the Luochengzhou Waterway leads to extensive erosion pits formed by various hydraulic actions such as dam flipping and circumventing flow.This results in increasing slope gradients or direct intrusion into the mattress,causing damage of building.The current erosion pits may further develop,underscoring the need for ongoing monitoring of local sediment dynamics and building changes.