Abstract: The application of microcapsule technoloty to the detergent builder was studied. The solid bleach activator (BED) with in the microcapsule was manufactured, in the system of ethyl-cellulose-polyethlene-cyclohexane and using separative method in oil phase. As it turned out that adding microcapsule (contain BED) to powdered detergent, the release temperature of bleach with oxygen was decreased.