EVALUATE THE IMPACT OF CHILDREN’S MALADAPTIVE BEHAVIOR MANAGEMENT PROGRAM ON PARTICIPATING GRANDPARENTS IN VIETNAM: A RANDOMIZED CONTROLLED TRIAL In the Vietnamese cultural context, grandparents often assist their children in raising their grandchildren. While children often exhibit maladaptive behaviors, grandparents show difficulty in dealing with those behaviors of their grandchildren. This article evaluates the effectiveness of children’s maladaptive behavior management program for participating grandparents in order to propose recommendations for completing and widely implementing a program to support grandparents to manage their grandchildren behaviors. The results of the repeated measures Analysis of Variance (ANOVA) analysis of the cognitive status, emotions and skills of the grandparents before the experiment, immediately after the experiment and three months after the experiment between grandparents of the intervention group and grandparents of the control group show that: The program is effective in enhancing grandparents’ awareness and skills in managing children’s maladaptive behavior, reducing the impact of children’s maladaptive behavior on grandparents’ emotions. This result shows that it is feasible to implement a training program for grandparents to manage children’s maladaptive behavior in Vietnam. ASEAN Journal of Psychiatry, Vol. 25 (6 ) August, 2024; 1-11.