An efficient capillary electrophoretic method was developed for the assay of superoxide dismutase in bovine erythrocyte. The buffer solutions used in this method was of 0.02M sodium borate (pH8.7). The linear range was 25-200 μg/mL (r=0.999) and recovery was 99.96 to 107.6%. The relative standard deviations for intraday and intereday analyses were 1.36% and 2.90% (n=3) respectively. This capillary electrophoretic method could be applied as a stability indicating assay method of bovine erythrocyte superoxide dismutase.