The purpose of the present research was to determine the relationship between the personality characteristics as well as styles of resolving interpersonal conflict and the marital adaptation of married students in Islamic Azad University, Tabriz branch. The study was correlational, and the sample consisted of 325 university students chosen from the married students of Islamic Azad University, Tabriz branch in 2009. The data were gathered using the Five Factor Inventory of NEO-Personality, the Lucke-Wallace Marital Adjustment Test (LWMAT), and Rahim Organizational Conflict Inventory-2 (ROCI-2). The obtained data were analyzed using the SPSS software and the statistical methods of Pearson’s coefficient of correlation, Independent T-test and step by step Regression. The research findings showed that there was a meaningful positive relationship between the personality characteristics (adaptability, extroversion, flexibility, and agreeability) and the marital adaptation (p<0.01). In addition, there was a meaningful negative relationship between affliction and marital adaptation (p<0.01). Among the different elements, conscience, adaptation, and affliction were able to predict the marital adaptation. Accompaniment style and compromise style had a meaningful positive relationship with the marital adaptation (p<0.01). Also, two styles of accompaniment and readiness to serve were able to predict the marital adaptation. The step-by-step regression analysis of personality characteristics and the styles of resolving conflict showed that the elements of conscience, agreeability, affliction, and accompaniment could meaningfully predict the marital adaptation. However, regarding the subjects’ gender, there was not a meaningful difference between the degree of marital adaptability among the male and female students. The findings showed that in psychological conflicts and training life skills, it is important to consider the personality characteristics along with the methods of resolving interpersonal conflicts.