The quality of paper is considered to be affected by the variations of Chemical and optical properties of unbleached and bleached kraft pulps obtained from the bleaching stages. In these samples, first the degree of polymerization was determined to follovv the degradation of polysaccharides during the bleaching. Then, the lignin contents as klason and acid soluble lignin vvere estimated in the pulps. DP values of cellulose in the samples shovved that the unbleached pulp vvas degraded during the bleaching stages and therefore, the cellulose in the unbleached pulp had the highest degree of polymerization. As expected, the bleaching resulted in the decrease of residual and soluble lignin in pulps after each stage. Additionally, the pulps obtained from each bleaching stage were studied vvith regard to their optical properties such as brightness, vvhiteness, k/s value, opacity and colour.