Good preparation on textile materials is very much needed for successful coloration. Natural or synthetic chemicals in the fibres can interfere with wetting and dyeing performance. Hence preparation is the series of processes used to remove these chemicals for the effective coloration and finishing of textile materials. By the good preparation of a material it is possible to produce an even and regular colour on the material with facing least difficulties. The aim of this paper is to determine the weight loss percentage after bleaching of different cellulose fabrics with various bleaching agents. For this investigation commercially available three types of cellulose fabrics such as plain weave, single jersey and (1x1) rib have been chosen. Weights of these fabrics were calculated before and after bleaching with two different bleaching agents such as sodium hypochlorite and hydrogen per oxide. From the weight variations, weight loss percentages of these three fabrics have been calculated and after the completion of this investigation weight loss percentages were found to be less after using hydrogen peroxide as compared to sodium hypochlorite.