Drum Screen is made of screen basket, machine bracket, gear motor drive device, belt drive device, riding wheel device, catch wheel device and spray pipe system, etc. Helical blades inside drum screen basket can transfer impurities. Light impurities along with pulp enters into screen basket from inlet pipe, in the effect of gravity, fine stock discharged through accepted pulp opening while light impurities transported by helical blade to the tail of screen basket then discharged. Spray system is installed on two sides of screen basket to clean the stock in impurities and keep screen basket unblocked.