Abstract: Magnetic Rolling technics is a pre-processing technics of magnetic separating flow,It has an effect on the lost rate of disposing tailings magnetic iron, This text introduced some mine along with deep exploitation,it's embedding granularity get little gradually, mine of lower magnetic rate and deficient accreting body added separating difficult. Some mine at one head enhanced the technics standard base manage, on the other head in order to reduce the lost of iron mental, control the disposing tailings grade to lower level, improve the recovery rate of mental, economize mineral resource, made the magnetic rolling technics upgrade research, main from these sides, from magnetic field size, from felling mineral layer thickness and adding the wide of the mineral layer, changing magnetic rolling running rate and feeding mine machine mean, aspiring researched new technics of raising original grade and reducing the tailings grade.