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The purpose of this study was to investigate the distribution of O2max and changes of blood metabolic substrates in Taekwondo compitition. Subjects as a T group were seven well-trained Taekwondo players. Control group was composed of seven healthy male students who taking Taekwondo club in D university. Data were analyzed by ANOVA with post hoc-test The 0.05 level of signifcance was as critical level for the study Result of this are as follows : Through Taekwondo competition, it showed that average lactate concentration were increased by rotating round in both groups, the concenttiation of Glucose and F.F.A were increased by rotating round in Taekwondo competition. TG concentration was gradually increased until 2 round but at 3 round it was decreased in T group.