The aim of the present study was to determine the relationship between perfectionism and competitive anxiety in Women's national karate team. Methodology: This is descriptive and correlational study in which 30 women from national karate team (adults and younger adults) formed the whole statistical population Completed the Martens Competitive state and competitive trait anxiety questionnaire and also completed the Dunn and colleagues’Sports perfectionism questionnaire. The findings of the research were analyzed using descriptive statistics (mean & standard deviation), Pearson correlation coefficient and Stepwise regression analyses. Results: Results from Pearson correlation coefficient indicated negative correlation between perfectionism sport and self-confidence, and a positive correlation with trait anxiety. Stepwise regression analysis results indicated that perfectionism is generally the strongest predictor of trait anxiety. Also, perceived pressure from the coach predictor of cognitive anxiety and self-confidence, and concern over mistakes and personal standards are predictors of somatic anxiety. Conclusions: moderating Perfectionism helps the athlete to be less affected by competitive anxiety, increases her self-confidence and thus, the probability of success increases.