为破解宁夏中部干旱带缺水难题，宁夏水利厅提出了固海扬水工程泵站“6+1”增流改造，即增加渠首泵站流量3.8m3/s。为了解决后续梯级泵站增流的问题，本文采用双吸离心泵叶轮交替加载技术对后续泵站叶轮进行改进设计，并针对固海扬水工程长山头和大柳木泵站两个型号共4台机组进行叶轮的试验改造和运行。结果表明，长山头泵站和大柳木泵站双吸离心泵叶轮应用交替加载技术改进设计后，机组流量均满足泵站增流设计的流量要求，水泵效率分别提高了13.6%和5.4%，泵站装置效率分别提高了9.2%和2.4%；现场的试验水泵和电机均运行正常，而且振动及噪音均小于未更换增流改造叶轮的水泵机组，水泵运行平稳，叶轮进口无明显汽蚀。研究成果为解决固海扬水工程增流改造提供了低成本的解决方案，也为其他泵站的改造提供了参考。

In order to solve the problem of water shortage in the arid zone of central Ningxia, the Guhai pumping station projects,"6+1" reconstruction project, was put forward by Ningxia Water Conservancy Department to increase the first stage pumping station by 3.8 m3/s. In order to solve the problem of increasing flow in the following pumping stations, this paper adopted alternate loading method for double-suction centrifugal pumps to improve the design of the impeller in the following pumping station. And four units in Changshantou and Daliumu pumping stations were put into trial operation and the impellers were revamped in Guhai pumping station projects. The results show that applying of alternate loading method for double-suction centrifugal pumps in Changshantou pumping station and Daliumu pumping station, the flow rate of the unit can meet the demand of increasing flow design of pump station. The pump efficiency increased by 13.6% and 5.4% respectively, and the efficiency of pumping station equipment increased by 9.2% and 2.4% respectively. The spot test pump and motor were running normally, and the vibration and noise were smaller than the pump unit without replacing the new impeller. The pumps run stably and the impeller inlet had no obvious cavitation. The research results provided a low cost solution for the improvement of increasing flow reconstruction of Guhai pumping station projects, and also provided a reference for the reconstruction of other pumping stations.