Maomai is used to enter the screen through bucket hoist, start the first screening and wind selection, get rid of most of the thicker and finer and light miscellaneous, and then start the first stone removal, can remove most of the medium and coarse stone and shoulder stone, after the first magnetic cleaning, start the second screening and air selection after cleaning the wheat, break the wheat machine, break the wheat and a small amount of sundries out. The water will be washed through the water machine to screen out the impurities of the small stones, carry out the second magnetic separation, hit the wheat, start the third screening and air selection after the wheat, remove the impurity particles on the surface of the wheat grain, and finally enter the wheat net warehouse. After grading treatment, the substances and particles were divided into four categories: skin, coarse material, heart powder and powder, and then entered into the second skin mill, cleaning machine, heavy screening and flour collecting screw machine in turn, and then purified by cleaning machine. According to this principle, four kinds of systems were formed: skin grinding, heart grinding, slag grinding and tail grinding. Finally, the wheat husk on wheat endosperm was cleaned and ground into a certain particle size flour. The screened flour is transported to the flour box or directly to the gluten car through the powder feeding system, in which the wheat gluten and germ are screened and the bag is introduced to the market.