It is used in grinding process of concentrator graded homework, under the appropriate of feeding concentrations, feeding particle size(200 mesh), the difference between the demand level grain content screen size and deeding particle size is less than 30%, under this conditions, the screening efficiency is as high as 70% above. Due to the high screening efficiency, can greatly reduce cycle load and sieve grain that qualified level, so as to improve the capacity of mill processing power(general it can be improved 5-10%), when controlling things under strictly in the screening process on the screen size, can eliminate the harmful effects which separating the coarse size with concentrate grain quality, The pulp under the work in high frequency vibrating sieve surface small amplitude, there is the role of intensity stratified according to function, high density and small particles is easy to settlement to the bottom of materials, thus obviously improve the grade of concentrates.