The purpose of this study was to investigate and analyze the in-depth influence of family leisure activity on emotional dynamics, considering the interactions between parent couple and among parents and their children. For this purpose, 400 students from universities located in the Seoul area were chosen as target samples through stratified cluster random sampling. The data, composed of questions related to type of leisure activity, leisure motivation, emotional dynamics were analyzed by such statistical analysis as one-way analysis of variance, simple and multiple regression analysis through SPSS Win program ver. 10.0. The findings of this study are as follows: Types of leisure and leisure motivation have a positive influence on emotional dynamics between the father and mother and among them and their children. In particular, when the family likes to join in home-oriented leisure activity, family differentiation level is high. In home-oriented activity and physical leisure activity, intellectual motivation has positive influence on family differentiation level such that emotional dynamics appears high.