Sanjiaoqi beach group in Chongqing is with complex external environments and presence of dual characters of mountainous river and reservoir.It is also characterized with complex beach features and faces serious navigation-obstructing problem.Based on the analysis of the river bed evolution laws and navigation-obstructing characteristics，we present the regulation thought.Combining with the model testing methods，we carry out multiple-scheme comparison and optimization，and select the scheme 1，fish-bone dike，as the final regulation scheme，which is characterized by reasonable layout and less cost.