There are many tributaries along Pinglu Canal with large branch drop，and the sudden flood of tributaries has a great impact on the navigable flow conditions of the canal.This paper selects Shaping River reach with large inlet angle，large branch and trunk confluence ratio and large river bottom drop as the research object，and adopts 1  50 normal river model test to carry out systematic experimental study on navigable flow conditions in this reach.The model test results show that due to the large sudden flood of tributaries and the large bottom drop of the branch river，the lateral flow velocity in the canal channel is large and the flow pattern is disordered.Coupled with the restriction of the railway bridge upstream of the tributary estuary，the arrangement length of the energy dissipation measures is limited，and the energy dissipation effect cannot be achieved.The analysis suggests that the main problem is that the lateral flow velocity of the canal is large after the tributary flood flows into the canal，so the treatment plan mainly solves the problem of “regulating water flow + energy dissipation”.Diversion levees，diversion piles and bottom inclined permeable separation levee are arranged at the interchanges，and energy dissipation measures such as deadling pool and dissipation sill are adopted in the tributaries.A series of scheme comparisontests are carried out.It is found that the navigable water flow under optimization scheme Ⅲ meets the navigable requirements and does not affect the railway bridge in the tributaries.