To reconstruct the hydrodynamics of the Shabei River Network in the Changhu water system of Jingzhou under limited water diversion, a joint gate group operation method based on gate regulation response characteristics and phased single-objective optimization was proposed. A one-dimensional hydrodynamic model was established to conduct sensitivity analysis of single-gate regulation, and key gates and their effective opening ranges were identified. Based on this, a joint gate group operation optimization model was constructed to systematically analyze and determine the optimal operation scheme. The results indicate that different gates have varying impacts on the hydrodynamics of different channels; single-gate regulation can hardly achieve coordinated improvement of hydrodynamics in both main and branch canals. Under the condition of an average daily water diversion flow of 5 m³/s, the optimal operation scheme increased the flow velocity in stagnant flow zones by over 25%, increased the average flow velocity of the river network by 14.72%-22.44%, and maintained the flow velocity above 0.1 m/s in main canals during the regulation process, effectively reconstructing the hydrodynamics of the study area and ensuring the water diversion and drainage functions of the river network.