The experiment was undertaken to investigate the optimum condition in the effect of seam balance on seam puckering. Four kinds of fabrics were sewed with three kinds of yarns which were used with a seam balance of 90, 100, 110 and 120%. In this experiment, the following conclusions were obtained; The best appearance was achieved by a seam balance of 100∼120% in Cotton fabrics, 100∼110% in Rayon fabrics, 110∼120% in Polyester fabrics and 120% in Wool fabrics after laundering.