Polymer composite materials are usedDuring the working process of the pump, the water flowing in the pump is affected by its friction with the flow channel and the impeller surface of the pump and the viscosity of the water body, and the energy consumed by the pump is mainly used to resist the flow friction and eddy resistance of the water surface. The energy consumed by water during the flow (head loss) is used to overcome the internal friction and friction between the water and the equipment interface. If the pump and impeller surface is smooth (this surface is called hydraulic smooth surface), the surface resistance is small. The energy consumption is small, the pump over surface and impeller spray polymer composite materials, so that the surface of the surface to form a hydraulic smooth surface, ultra-smooth surface coating surface finish is 20 times that of polished stainless steel, this extremely smooth surface reduces the delamination of the fluid in the pump, thereby reducing the turbulence inside the pump, reducing the volume loss and hydraulic loss in the pump, and reducing power consumption. To achieve the purpose of reducing the loss of water resistance, so as to improve the hydraulic efficiency of the pump, and at the same time, to a certain extent, it can also improve the mechanical efficiency and volumetric efficiency. The compactness of the molecular structure of the coating can isolate the contact between air, water and other media and the base metal of the pump impeller, minimizing electrochemical corrosion and rust. In addition, polymer composite materials are polymers, which have chemical resistance, can improve the corrosion resistance of the pump, and can greatly enhance the pump's resistance to erosion and corrosion.