The focus of this study is primarily on “the discrepancy in mentality as an important factor affecting Family problems and divorce”. For this purpose, some minor studies were conducted each of which experimentally examined different aspects of mental discrepancy in Iranian families. Almost all of these studies showed that permanent disputes and divorces resulted from the differences in their world-views, thinkings, and impressions in their mutual affairs. At last, the theory of Homogamy with two major revisions were used to explain the reasons and causes of Family problems and divorce which were confirmed in minor studies and cases.