Journal of Counseling Research

The current research with the aim of investigating the relation between differentiation (I-Position), secure attachment style and marital satisfaction with couple optimism intermediary was done among the first –grade students parental of Darab city in the years of 2012-2013. Three hundreds and fourteen parents were selected using the method of multi-clustering sampling and they completed the questionnaires of Self Differentiation (I-position), secure attachment style, optimism of couple and marital satisfaction, The data were analyzed by the method multiple hierarchical regression simultaneously with method of Baron and Canny for studying the two designed models. The findings about the first supposed model showed that there are a positive relationship between I-position, couple optimism, and marital satisfaction, couple optimism is an mediate between I- position and marital satisfaction. The findings about the second supposed model showed that there are a positive relationship between secure attachment style and couple optimism, and marital satisfaction. The couple optimism is a mediate between secure attachment style and marital satisfaction. These results confirm that the primary relationship of people in a family environment leads to the shaping of special attachment style and states of low or high differentiation and these primary experiences have direct effect on couples’ interpersonal relationship in adulthood. Couple optimism also has the intermediary role between secure attachment style and I-position with marital satisfaction.