Introduction: The purpose of the present study was to investigate the mediating role of trust and security in the relationship of differentiation with marital intimacy in women. Materials and Methods: The statistical population of this descriptive-correlational study consisted of all non-clinical married women living in Mashhad in 2018 who were selected by the convenient sampling method and according to Morgan table, 400 persons were selected. Data were collected using Bagarozzi Intimacy Questionnaire (2001), the Self-Differentiation Questionnaire of Scorone and Dundee (1998), the Gutman Trust Questionnaire (2012), and the Maslow Psychological Security Questionnaire (2004). After data collection, descriptive statistics, structural equation method along with regression and Pearson test and AMOS 24 and SPSS software were used to analyze the data. Results: The results of structural equation analysis showed that the proposed model fits the data (GFI= 0.83, RMSEA= 0.04). Also the results of regression analysis showed that trust and security had mediating role in the relationship between differentiation and marital intimacy (P= 0.001). Conclusion: Based on the findings, differentiation affects marital trust, sense of security and intimacy. Therefore, by increasing the differentiation of people in marital trust, their intimacy and sense of security can be increased. Keywords

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