Based on Manbing beach risk regulation in Lancang River，this paper analyzes the causes of navigation obstruction from the canyon beach risk gradient，flow velocity，flow pattern，and beach risk abatement indicators to deal with water level fall decline in beach risks and upper beach risks caused by canyon-type beach risk regulation.The basic channel dimensions should be protected by reef blasting，and the regulation structure should be abandoned to mitigate the water level fall of beach risk regulation and adjacent upstream beaches.The results show that in the regulation of broad-shallow and narrow-deep，shallow areas and deep pools，the cross-section structure of narrow deep reef blasting and body structure of broad-top adverse slope submerged dam can reduce the water level fall under the premise of meeting the basic channel dimensions of the beach.This provides certain references for future regulation of similar beach risks.