Water pump is a machine that conveys liquid or makes liquid pressurized. It transmits the mechanical energy of the prime mover or other external energy to the liquid to make the liquid energy increase, mainly used to convey liquids including water, oil, acid and alkali liquids, emulsion, suspension emulsion and liquid metal. Can also convey liquids, gas mixtures and liquids containing suspended solids. Technical parameters of water pump performance are flow rate, suction range, head, shaft power, water power, efficiency, etc.; according to different working principles can be divided into volume pumps, vane pumps and other types. Volume pump is the use of its studio volume changes to transfer energy; vane pump is the use of rotary vane and water interaction to transfer energy, there are centrifugal pumps, axial flow pumps and mixed flow pumps and other types.