Aiming at the issue of slow water flow in the inland rivers of Ningbo City, which requires the improvement of hydrodynamic performance through the reclaimed water replenishment and pump gate operation scheduling, a two-dimensional hydrodynamic model of an inland river network in a certain area of Ningbo City was constructed based on measured topographic data. The model was used to simulate and analyze different engineering measures and combined operation conditions of various pump stations. The results show that excessive culverts and sluice gates, as well as insufficient water sources, limit the water exchange and overall flow in the river channels. Increasing the replenishment amount of reclaimed water cannot effectively improve the water mobility. Adding Pump Station No.1 and physically modifying key river sections can significantly increase the water flow velocity in originally stagnant river sections and improve the mobility of the entire water system, but attention should be paid to potential environmental and water quality impacts on river sections with different water qualities. Increasing the drainage capacity of pump stations significantly increases the river flow velocity and water level, but shortens the duration of high flow velocities. Simultaneously operating multiple pump stations and increasing water supplementation can significantly increase the water velocity of the entire river network. Especially under high water level conditions, although the flow velocities are relatively low, increasing the amount of supplemental water can still effectively improve the water mobility.