The purpose of this study was to investigate the relations between married adults` level of self differentiation and their life satisfaction. Questionnaire survey method was used in this research. The sample was taken from 403 married adult in Chonnam and Sunchon city. The collected data were analyzed by using frequency, percentage, mean, standard deviation, correlation and multiple regression analysis. The findings of this study are as follows ; 1) The total points of the self of differentiation of married adult`s was 105.0, which was higher than the median 80. And the total points of the life satsfaction was 47.3, which was higher than the median 42. 2) In the case of married man, there was correlation between age, educatin level, economic state, health state, occupation, a number of brothers and sisters, religion and married adult`s differentiation of self. And there was correlation between health state, occupation, married adult`s differentiation of self and the life satisfaction. In the case of married women, there were correlation between age, educatin level, economic state, health state, occupation and married adult`s differentiation of self. And there was correlation between married adult`s differentiation of self and the life satisfaction. 3) In the most of cases, the variable significantly affecting the life satisfaction was the self of differentiation.