The traditional research on the influence of navigation conditions cannot fully and accurately reflect the comprehensive influence of waterway flow conditions and boundary conditions on ship navigation and the interaction between ship and waterway flow conditions.Using the small scale ship model measurement and control technology,the experimental study is carried out on the navigable water flow in the upper and lower waterways of Dadu River Moshui navigation-power junction and the upstream wharves berthing and unberthing.This paper carries on the quantitative and qualitative analysis combined with experimental study results,proposes hub upstream and downstream channel maximum navigable discharge of 4 500 m3/s,which provides a scientific and reliable data basis for key project plan design optimization and unberthing upstream port scheme selection.