Positive displacement pumps: the use of the working chamber volume to transport liquid cycle. Vane pump: the use of the interaction between the blades and the liquid to transport liquid pumps are transporting liquid or liquid pressurized machinery. Transfer mechanical energy or other external energy to the liquid will prime mover, so that the liquid energy increases, primarily used to transport liquids include water, oil, acid and alkali liquid, emulsion, suspension, and emulsion liquid metal, but also transport liquid, gas mixture and a liquid containing suspended solids. Measure the performance of the technical parameters of the pump with a flow, suction, head, shaft power, water power, and efficiency; according to different works can be divided into volume pumps, vane pumps and other types. Volume of the pump chamber volume is to use its energy to deliver change; vane pump is the use of rotary vane water interactions to transfer energy, there are centrifugal, axial and mixed flow pumps and other types.