Parent-mediated interventions are considered as an effective intervention to treat children with autism spectrum disorder (ASD). Most of these interventions focus on the Social-communicative Deficits (SD) and ignore Behavioral Excesses (BE). To address this need, a Family based Program for Managing Autistic Behavioral Excesses (FPMABE[0]) was developed. The purpose of this study was to evaluate the effectiveness of this program on three parents of children with ASD. This study was a single-subject design and was performed on three children with ASD aged 2 to 3 years old. Parents of these children received 10 individual sessions of FPMABE. 9 stages of evaluation were performed (3 evaluations in baseline, 5 evaluations during treatment and one evaluation in follow up). The instruments used in this study were the Repetitive Behavior Scale-Revise (RBS), Autism Treatment Evaluation Checklist and The Aberrant Behavior Checklist. To analyze data, visual analysis and effect size were used. The results of the study showed that BE such as stereotyped behaviors (d= 82%), selfinjury (d= 100%), compulsive behaviors (d= 85%), rituals (d= 85%), sameness (d= 100%), restricted behaviors (d= 83%), irritability (d= 79%), echolalia (d= 84%) and hyperactivity (d= 26%) decreased. At the same time, SD (such as Speech/communication, Sociability) improved without any intervention on behavioral deficits. Since, the results of this study support the effectiveness of the FPMABE, it is recommended to use this program as an early intervention for the treatment of children with ASD even prior to treatment of SD to take advantage of family-based programs.