The Lujiahe waterway is characterized by navigation obstruction with steep gradient,rapid flow,shallow water and width problems,especially the falling ridge in the middle section of Shahong channel has plagued the river regulation for a long time.This paper probes into the formation reasons of the falling barrier and its effect on channel and carries out exploratory regulation.The results show that the formation reasons of the falling barrier include the geomorphological and geological factors,and the influence of the Three Gorges reservoir’s impoundment;the falling barrier aggravated steep slope and rapid flow phenomenon and channel obstruction.After the implementation of dredging,the channel depth in the shallow area is ensured,and the large ratio drop in the falling barrier area is significantly reduced.