The possibility of reusing wastewater in polyester dyeing processes was investigated. The wastewater in disperse dyeing was decolorized with activated charcoal and/or chemical reduction. The treated wastewater was reused for the polyester dyeing with disperse dyes. The characteristics(color strength, color difference, and fastness etc.) of fabric in the original bath was compared with that of the fabric in the reused dyebath. It is possible to reuse wastewater treated by chemical and/or physicochemical methods in polyester dyeing with disperse dyes.