Summarize As advanced water supply equipment, The Pump System comprises more than 2 pumps in parallel and is combined with the latest technology PID control panel, thereby supplying water with constant pressure. Generally, The type of booster system is divided into step control type using pressure switch and variable speed control type using Variable Frequency Converter, Especially, variable speed control type is recommended in that it keeps the water pressure constantly by controlling the RPM of pump motor. We have developed the key components for booster system,such as variable frequency drive and PID controller using the latest technology.