Abstract: The rural running water system commonly uses tower-style water supply，which demands men to monitor the water level，often turning out phenomena such as overflowing and lacking.Because of relatively high power of pump，it causes waste of human resource，electricity and water resource.A new type of solar energy running water supply system was designed.The water tower was installed liquid level sensor monitoring change of water level momently，via the single chip microcomputer，achieving goal of automated process on pumping and stopping pumping.At the same time，it used a solar energy tracking system，MPPT charging controller and buck chopper to supply electricity for the pump and control circuit.Experiments showed that this type of running water supply system achieved goal of monitoring water level momently and automatic operation of solar energy driving pump，also solved with problems of overflowing and lacking，attained goal of using water efficiently by saving water and energy.