This research has been conducted through path analysis about what effect self–differentiation of married couples has on family differentiation, marriage satisfaction, and marriage stability. Subjects of this research were married men and women who are living in Seoul, Gyeonggi, Daejeon, Daegu, Busan and Gwangju, with the period of research being from January 7th to April 5th, 2012, and total of 525 surveys were used for the final analysis. The research model was verified via SPSS 26.0 and Amos 26.9. Results included the following; first, self–differentiation affects family differentiation and marriage satisfaction for wife group, while it affects family differentiation for husband group; second, family differentiation affects marriage satisfaction for wife group, while it equally affects marriage satisfaction and marriage stability; third, marriage satisfaction affects marriage stability both the wife and husband groups; and fourth, within wife group, self–differentiation does affect marriage satisfaction through family differentiation, but it does not affect marriage stability. On the other hand, self–differentiation of husband group affects marriage satisfaction and marriage stability through family differentiation. This shows that family differentiation experiences of husbands are affecting marriage satisfaction and marriage stability in positive ways, while for wives, this role is played by marriage satisfaction.