Objective: This study investigated the training effectiveness of positive parenting program on mothers’ stress with Attention Deficit Hyperactivity Disorder. Method: In this study 24 mothers with ADHD children were chosen and were equally assigned to two control and experimental groups. In addition to common medical treatments for both groups, experiment group was presented with positive parenting training for 8 sessions of 2 hours per week. Instrument was parenting stress questionnaire with 101 questions in 3 stages .Data were analyzed using analysis of variance with repeated measure. Results: The results show that the positive parenting program reduced stress of children’s mothers with ADHD. Conclusion: It is suggested that this method could improve the parent’s mental health, be taught to mothers in conjunction with conventional methods.