The control core of the fully variable frequency water supply system is the pump frequency converter. The principle is that the controller automatically adjusts the pump speed according to the target pressure set by the user, and controls the flow stabilization system pressure. The system can automatically adjust the number of pump operations according to the size of the water consumption, automatic timing rotation, can achieve water operation, water suspension and sleep, energy saving effect is remarkable, each pump is a soft start soft stop, reduce the impact on the power grid pipe network, prolong the service life of the system. With external expansion, optional host computer monitoring, etc., intelligent and reliable, is the development direction of today's water supply applications.