US Patent 7621013 Method of washing laundry in drum washing machine

Disclosed is a method of washing laundry in a drum washing machine by which the amount of wash water used and the amount of power use can be decreased when doing washing in the drum washing machine. The method comprises supplying wash water to a tub up to a first preset water level; and washing laundry in a drum by rotating the drum of the drum washing machine forward and backward simultaneously while drawing the wash water and supplying the drawn wash water to the drum.