Objectives: The purpose of this study was to explore differences of fathers’ and mothers’ parenting behaviors, sharing, and stresses by levels of family system functioning in families with young children. Methods: The sample of this study included 1,611 first married couples having at least one child aged under 5 years in the 6th wave of the Panel Study on Korean Children(PSKC). Results: It was found that fathers’ cohesion and flexibility were higher than mothers’. It was also found that there were significant differences in fathers’ and mothers’ parenting behaviors, sharing, and stresses by the level of family system functioning. Conclusions: This study suggested that the family system functioning are related to parenting in families with young children. Further implication were discussed for enhancing family system functioning and parenting behaviors of young children.