In addressing the challenges posed by the reconstruction of the Mashi ship lock,including a large lock chamber,high water head,and stringent hydraulic requirements,a physical model with a scale of 1:25 is established.The hydraulic characteristics of the water filling process,berthing conditions of the ships,pressure characteristics in the water transfer corridor,and flow conditions in the inlet/outlet and approach channel are investigated.The results show that through the implementation of optimization measures such as incorporating energy dissipating blocks in the open ditch,enlarging the turning radius of the corridor protruding body rising cans,increasing the inlet area,and decreasing the inlet elevation,all hydraulic indicators meet the specified standards and design requirements under the recommended valve opening mode.The research results can provide reference for similar engineering projects.