Abstract: Through analysing power consumption composition,discuss the energy saving design method of Liquid-Ring Vacuum Pump,and more discuss the energy saving design and manufacture on the flow passage components including impeller、distribution plate and pump body,research and provide the energy saving design method of Liquid-Ring Vacuum Pump flow passage components,raise designing the liquid-ring vacuum pump to adapt to different entrance pressure,and example the type selection method of Liquid-Ring Vacuum Pump.