Stress in daily lives has a negative effect on individuals’ adaptation. This study aimed to examine the effect of daily stress on intimate relationships and the moderating effect of emotion expressivity. Data were measured from 158 participants who had intimate relationship. As the results of the analysis, daily stress has a significant effect on participants’ intimate relationships: the more stress, the less satisfying relationship, and vise versa. Emotion expressivity also has a significant moderating effect on the relationship between daily stress and intimate relationship satisfaction. Specifically, high daily stress with high extend of emotion expressivity in intimate relationship has proven to have significant negative effect on intimation relationship satisfaction. Considering that the most amount of emotion experienced during stressful situations is supposed to be negative, the result of this study implies that expressing negative emotions harms the quality of intimate relationships. In other words, even in an intimate relationship, individuals had better express less emotion to make the relationship more satisfying, if they have lots of stress.