The purpose of this study was to examines the mother-child interaction longitudinal effect of a counseling intervention H.E.A.R program for postpartum depression. The subjects were 14 mothers with a postpartum depression scale score of 13 or higher and were divided into experimental group (EG, n=6) and control group (CG, n=8). EG were measured five times before and after intervention and CG were measured in the same way without the program. The results were as follows: First, there were significant differences between EG and CG in all measured variables. Second, longitudinal effects were not observed only for mother's language expression. Third, the largest effect was observed in mother-child interaction, followed by postpartum depression. This study was significant in that it verified the longitudinal effects of a short-term postpartum depression intervention counseling program in the area of postpartum depression intervention, where structured counseling programs were lacking.