The Islamic Republic of Iran, relying on the principles and criteria of Islamic-religious governance, has committed itself to the development and expansion of peaceful interaction, peacemakers, and faithful coexistence at the global and regional levels, and political diplomacy emphasizes cultural components (religious capital), reducing civil conflicts and international conflicts, and increasing strategic cooperation between political systems. The main objective of the research is to study the effect of religious capital on the development of social tolerance in the Islamic Republic of Iran in the historical process. The research method is quantitative meta-analysis and systematic review, relying on scientific sources and documents published on the Normagz, Mag Iran, and Iran Doc websites in the period 2004-2014. From the statistical population of 38 studies; By observing the screening stages and entry criteria (survey and quantitative, having a sample size and Pearson and Spearman correlation coefficient, level of significance and scientific validity); 17 documents were selected and entered into the cma2 software using a non-probability sampling method (intentional and accessible); The test used is Cohen's d and Fisher's f and Q tests. Finally, the Cohen and Fisher effect size coefficient shows that religious capital (norms, values, beliefs, belonging and religious-religious rituals) reproduces peace-seeking,