This study is to prove the theory of homogamy and the theory of complementary needs. Socio-demographic variables and personality characteristics of the husband and the wife were combined to make `homogeneity` variables of the couple. These variables and the degree of marital conflict were analyzed by the method of ANOVA and Duncan`s Test. Religion is a kind of variable in which respect the couple needs to be homogeneous in order to reduce marital conflict. If the husband is high and the wife is low in income, they get along with each other. In terms of education, when both the husband and the wife are high in schooling, they tend to have less conflict. In order to reduce conflicts between the husband the wife, the couple need to be high in personality characteristics such as sociability, stability, responsibility, and dominance. However, even when one spouse in high in those characteristics and the other is low, the couple tend to have less conflict than when both the husband and the wife are low in those characteristics. These results could be applied to constructing family life education programs for unmarried men and women or married couples.