This study examined the relations between coparenting, marital quality, mothers’personality and children’s initial temperament. Subjects were 174 mothers of 4~6 year-old children, and they answered questionnaires regarding coparenting, marital quality, personality, and initial temperatment of their children. For mothers of both boys and girls, positive marital quality wass related positively to warmth, support, and integrity coparenting and negatively to conflict coparenting. Only for mothers of girls, higher warmth and integrity coparenting was shown when they were extroverted. while those who were neurotic showed higher conflict coparenting. For mothers of boys, support coparenting was low when their sons were emotional. Mothers of girls showed lower level of warmth and integrity coparenting when their daughters were avoidant. emotional and sensitive.