Based on the experimental study on the navigation technique of Honghua hydro-junction project and the overall physical model,we study measures for improving the navigation flow condition and optimizing the operation mode of the junction.The result shows that under the condition of rather complicated current at the upstream of the junction and swirl and swirling water bubbles at the entrance area,we can adjust the flow through setting diversion dams, partial leveling and adjusting the length of the diversion wall;while the flow at the downstream can be adjusted by optimizing the operation mode of the hydro-junction.