One of the most critical periods of women’s life is pregnancy, which tends to induce large changes, including the physiological and psychological changes. These changes cause disorders such as stress in the mother and require the use of coping strategies. Personality factors affect the choice of appropriate coping strategies.This study aimed to determine the relationship between personality characteristics and level of perceived stress and coping strategy with in mother during all three trimester of pregnancy. Methods: This correlation studywas conducted on 500 pregnant women referred to 20 health centers in Mashhad with helping multi-stage sampling in 2014.The data collection tools included: Demographic, obstetrics & gynecology Questionnaire, Hardiness Questionnaire (Survey questionnaire personal view Kobasa), Optimistic Questionnaire (Life orientation test- Revised), Revised Prenatal Coping Inventory and Perceived stress scale.Data were analyzed by statistical software SPSS version 16 using multiple regression Test andSpearman. Findings: Results showedthat there is a significant positive linear relationship between psychological hardiness, optimism and spiritual and preparation- planning coping strategies (p <0.0001) however it was correlatedsignificantly negatively with avoidance strategy (p <0.0001). More hardy and optimistic pregnant women received less stress (p<0.0001). Conclusion: Personality characteristicsare associated with coping strategies and stress levels in pregnant women. Keywords: Pregnancy, Stress, Coping Strategies with Stress during Pregnancy, Coping Strategies with stress, Psychological Hardiness, Optimism

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