Cellulase is a kind of enzyme preparation which produced by cellulase modification. The cellulase of which with high alkaline be used as an ingredient for detergent. In the washing process, cellulase can effectively remove microfiber on fabric for wear. It also can keep cotton fiber fabric with bright color and good smoothness. Therefore, after the washing with cellulase, white clothes will be whiter and color clothes will be brighter and softer. At the same time, it can get off the granular dirt in the fiber.