The aim of this study is to investigate the relationships between adversarial growth and cognitive coping of parents whose children have developmental disabilities related to time course. Although the progression of cognitive coping regarding adversarial growth might be established as time goes by, rather instantaneously, there exist very few reports on this research topic. For this inquiry, 248 mothers and fathers of children with developmental disabilities were asked to complete Cognitive Emotion Regulation Questionnaire, Posttraumatic Growth Inventory, Parenting Stress for Parent of Children with Disabilities Inventory and Psychological Wellbeing Scale. The results were as follows. First, adversarial growth showed positive correlation with psychological well-being and the positive correlation became stronger when caregiving duration was longer. Second, multi-variate analysis showed that there were differences in cognitive coping strategies according to the duration of caregiving and the level of adversarial growth. Finally, multiple regression analysis showed that cognitive coping strategies significantly predicted parents'' adversarial growth differentiated from duration of caregiving. The implication ,limitations of this study and suggestions for further research were also discussed.