Regarding the crossover effects in which work-family conflicts, consequent job/ marital satisfaction, and mental health influence both spouses, this research aims to study 187 dual-career couples to investigate the following 3 types of crossover effects, positioning a coping behavior as a mediator and a buffer; 1. the direct crossover effect in which a spouse’s work-family conflicts, satisfaction, and mental health influence those of the other spouse, 2. the indirect crossover effect in which a spouse’s work-family conflicts influence the satisfaction and mental health of the other spouse through coping behaviors, and 3. the buffer effect of coping behavior in which coping behaviors alleviate the negative effect exerted by a spouse’s work-family conflicts on the satisfaction and mental health of the other spouse. Results showed family → work conflict and marital satisfaction have direct crossover within couples. Indirect crossover effects were found as follows; husband’s family → work conflict influenced marital satisfaction of wife via marital coping of wife, while wife’s time conflict influenced marital satisfaction of husband via marital coping of husband. Finally, we discussed interpersonal effects and gaps in couples.