Background: The early relationships between infant and care takers are significant and the emotional interactions of these relationships play an important role in forming personality and adulthood relationships. Objectives: The current study aimed to investigate the relationship of attachment styles (AS) and emotional intelligence (EI) with marital satisfaction (MS). Materials and Methods: In this cross-sectional research, 450 married people (226 male, 224 female) were selected using multistage sampling method in Mashhad, Iran, in 2011. Subjects completed the attachment styles questionnaire (ASQ), Bar-On emotional quotient inventory (EQ-i) and Enrich marital satisfaction questionnaire. Results: The results indicated that secure attachment style has positive significant relationship with marital satisfaction (r = 0.609, P< 0.001), also avoidant attachment style and ambivalent attachment style have negative significant relationship with marital satisfaction (r = -0.446, r = -0.564) (P < 0.001). Also, attachment styles can significantly predict marital satisfaction (P < 0.001). Therefore, emotional intelligence and its components have positive significant relationship with marital satisfaction; thus, emotional intelligence and intrapersonal, adaptability and general mood components can significantly predict marital satisfaction (P0.05). Conclusions: According to the obtained results, attachment styles and emotional intelligence are the key factors in marital satisfaction that decrease marital disagreement and increase the positive interactions of the couples.