The application of the bleaching activator tetraacetylethylenedi-amine(TAED)in one bath scouring and bleaching of cotton knitted fabrics is discussed in this paper.The effect of the dosages of H2 O2 and TAED,the scouring and bleaching time,and the temperature on fabric whiteness was investigated.The optimal conditions were obtained when the bleaching activators TAED was used based on whiteness.