This paper was to investigate the effects of conjugal power and gender role attitudes on marital satisfaction of middle-aged couples. This survey was conducted from April, 2011 to May, 2011 and 265 responses from the survey were used for the analysis. The data was analyzed by descriptive statistics, t-test, ANOVA pearson correlation and multiple regression. The research findings could be summarized as the followings. First, the mean scores of gender role attitude, conjugal power, marital satisfaction of the marital middle-aged couples were higher than averages. Second, gender role attitude and conjugal power were the significant predictors to explain marital satisfaction of marital middle-aged couples.