Slurry pump is mainly used to convey solid-liquid mixture containing hard particles, widely used in coal, metallurgy, mining, thermal power, chemical industry, water conservancy and other industries. The transported solid-liquid mixture in the high-speed rotating impeller presents non-regular movement, the pump overflow parts in this "liquid sand wheel" working conditions, subject to strong wear and tear, but also to bear the corrosion of the medium, resulting in shortening the life of overflow parts. Therefore, the design of slurry pump is fundamentally different from the design of water pump. The design of clean water pump mainly pursues efficiency and cavitation index, while slurry pump should focus on cavitation, wear resistance, corrosion resistance, etc. while pursuing efficiency.