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.