The purpose of this study is to explain the test of the mediating role of demographic features in relation with marital conflicts and attachment styles. The studied samples were 150 couples visiting the consulting centers of the city Shiraz who were selected by the purposeful sampling method among 800 couples. They filed out adult attachment styles and marital conflicts and also demographic questionnaire. The findings showed that secure attachment style has a direct and negative effect on marital conflicts. Besides, avoidant and ambivalent attachment style has a direct and positive effect on it. Moreover, age has a direct and positive effect but education has a direct and negative effect on marital conflicts. Results showed that the conflicts in samples with secure attachment style will be increased by increasing age and they will be reduced by increasing the level of education. Because in people with secure attachment style, increase of age and academic level leads to their intellectual growth and therefore, they adapt more active and flexible approaches to the resolve their problems and conflicts flexibility in solving problems and conflicts. Besides, they use a variety of intellectual methods and pay more attention to their spouses, they use a wide spectrum of solutions so that the level of their conflicts would be reduced.