A vortex pump can not be used to pump more viscous media. As the viscosity of the liquid increases, the head and efficiency of the pump will decrease drastically and the viscosity of the medium will be limited to 114 centistokes. Two pumping medium is limited to pure liquid. When liquids contain solid particles, they can degrade pump performance or cause the vortex pump to become inoperable due to increased axial and radial clearance due to wear. Third, lower efficiency, up to 55%, most of the efficiency of the vortex pump 20-40%, thus preventing it from the direction of high-power development. IV vortex pump cavitation performance is poor. V. Vortex pump impeller and the pump between the radial clearance and axial clearance of the more stringent requirements to the processing and assembly process to bring some difficulties.