一、问题的提出。我省机电排灌站大都分布在珠江三角洲、沿江滨海地区,排涝扬程一般在三米以下,有的地方仅几十公分。在五六十年代建设的泵站,即使是七八十年代初期兴建的泵站,都同样存在着实际扬程低于水泵的最佳性能扬程,使抽水装置长期偏离最优工况运行,泵站效率低,能源消耗大。经实地测试调查,规划设计较好的泵站,其效率不过是35—50％,许多泵站低于20％影响泵站效率 First, the question raised. Electromechanical irrigation and drainage stations in our province are mostly distributed in the Pearl River Delta, along the coastal areas, drainage head generally less than three meters, and in some places only a few dozen centimeters. Pump stations built in the 1950s and 1960s, even those built in the early seventies and eighties, also had the best performance head lift lower than the actual pump head so that the pumping unit deviated from the optimal operating condition for a long time. Pump stations Low efficiency, energy consumption. The field test investigation, planning and design of a good pumping station, the efficiency is but 35-50%, many pumping stations less than 20% affect pumping efficiency