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The purpose of this study was to examine the effect of octacosanol administration on ratings of perceived exertion(RPE) and serum enzyme activity for taekwondo athletes for 4 weeks. The subjects in this study were 7 high school taekwond athletes, who were divided into two groups. During the administration period, one group took octacosanol for 4 weeks(40mg/day: content of 100% octacosanol), and the other was the placebo group(empty capsules). The subjects performed exhaustive exercise on a treadmill. The ratings of perceived exertion(RPE) measured using of Borg & Noble(15 scale). Plasma was sampled from an antecubital vein using a hypodermic syringe at rest, post-exercise(all-out), recovery 10 min and 30 min after incremental maximal exercise. The result was as follows. First, The ratings of perceived exercise(RPE) were significantly decreased by octacosanol(6, 7 stage: p<.01). Second, The CPK(Post, Recovery 10 min: p<.01; Recovery 30 min: p<.05) and LDH(Post, Recovery 10 min, Recovery 30 min: p<.01) were significantly decreased by octacosanol. In conclusion, taking octacosanol before exercise may have greater effects of ergogenic aids than dose placebo.