Abstract: With the increasing scarcity of water resources and growing pressure for energy conservation and environmental protection, energy efficiency optimization of pump systems in the water supply sector has become particularly crucial. Optimizing pump dispatch and operational strategies can enhance the energy utilization efficiency of water supply systems, reduce operational cost, and achieve green and sustainable water resource management, which has significant economic and environmental benefits. This paper presented a parallel pump curve parameter optimization method based on gradient algorithms, constructed a framework for evaluating the operational efficiency, and combined optimization scheduling of parallel pumps. Taking the water supply pump station at Hongpan Water Supply Plant in Linping District, Hangzhou as an example, the effectiveness and feasibility of this technique were verified, with the calibrated pump having an absolute percentage error within 3% for 98% of the operation time, and the optimized pump combination efficiency improved by 4 to 6 percentage points compared to the original scheduling plan. This ensures low-carbon and efficient operation of the pump station under various working conditions. The achievements of this study can help reduce the energy consumption of water pump stations, improve their operational efficiency, and provide a reference and inspiration for optimizing the scheduling of similar water pump stations.