Abstract: In order to tackle the problems encountered in the medium circulation system, a series of effective measures have been adopted, including remolding structural design of feed box of medium draining screen, hanging baffle plates to decrease feeding velocity, cleaning regularly the opening of screen′s qualified medium section to improve medium draining effect, adding a larger and a smaller dirt removal devices to thoroughly eliminate the phenomena of plugging of screen′s spray nozzles, and switching to the use of appropriate screen deck with reduced size of openings to avoid tossing of liquid surface due to blocking of magnetic separator. The adoption of the measures has led to effective reduction of consumption of medium per ton of raw coal treated from 0.72 kg down to 0.40 kg, enabling the plant to save an amount of 563, 200 yuan per year, cut down coal preparation costs and improve economic performance.