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Background&Objective: Precelampsia with prevalancy of 5-10% is one of the important causes of maternal morbidity and mortality and neonatal prematurity that prevention of it has aessential role in reduction of maternal and fetal mortality. Pathogenesis of disease is endothelial dysfunction and free radicals can exaggerated of endothelial damage.this study designed to evaluate antioxidants (vit E,C) effect on preeclampsia in primipar women. Materials&Methods: This study was a randomized clinical trial in 580 primipar women that randomized in two treatment and control groups. To the Treatmet group in 18-22w of gestation during routin prenatal care vitamin E (400 IU) and vitamin C (lg) administrated daily untile end of pregnany. Control group recieved routin ferrous sulfate and incidence of preeclampisa compaired in two-group .Data analyzed by chi-square test. Results: Incidence of preeclampsia was 1.7% in treatment group and 6.2% in control group (p<0.05). Conclusion: antioxidant (vit E,C) have an effect on reduction of preeclampsia incidence.