The quality of the flow conditions in the entrance area directly affects the safety of navigation. In view of the problems such as the large transverse velocity and the poor flow conditions in the entrance area and the connecting section of the upstream of Fengguang hydro-junction’s expanded locks，we carry out the model experiment of Fengguang hydro-junction，based on which，we shorten the length of the navigation wall in the entrance area of the upstream by 40 m，adjust the spacing of diversion piers to 5 m，and increase the number from 4 to 7，and the distance between the end of the downstream diversion pier and the navigation wall is 7 m. The test results show that after the navigation wall is shortened，the distance between the entrance area and the upstream river bend increases，and after the distance between the diversion piers reduces，the water permeability between the piers decreases，thus water flow condition is obviously improved and meets the requirements of the code. The ship model navigation test shows that the maximum navigable flow is Q10%=6 077 m3/s，the ship model can pass through the lock safely and stably，and the control parameters meet the requirements of the specification.