The purpose of this research was determining the relationship between personality traits, coping style and stress. coping style tests (Billings and Moos, 1981), personality questionnaire of short-form NEO and Perceived stress scale (Cohen and Colleagues, 1983) was done through using sample volume 329 students of Guilan University that were selected via multi-phases cluster sampling method. Data were analyzed through multi-phases Pearson and Regression correlation method. Finding showed that there is a significant relationship between stress, personality traits and coping styles (emotion-based and problem-based). Also, there is a positive and direct relationship between neuroticism and emotion-based coping style and there is a reverse relationship between agreeableness and emotion-based coping style, but there is no significant relationship with other personality traits. The other findings showed that there is a significant and negative relationship between neuroticism and problem-based coping style and there was a positive and meaningful relationship

Stress comes from different sources and has social, physiological, peripheral and psychological factors that involve all dimensions of human life. Because of being exposed to many of peripheral tension factors are inevitable, having some of the psychological traits and skills will enable the person to suffer slight between other factors of personality and problem coping styles. According to findings we can conclude that intent of stress among students is increasing and use of problem-based style cause to decrease the stress.