The differences between Obsessive-Compulsive Disorder(OCD)and Autism Spectrum Disorder (ASD) should be considered from the perspectives of onset period, emotional characteristics that come along with obsessiveness, presence of social impairments or communication difficulties, and existence of obsessive thoughts.
 Although typical clinical presentations for these two disorders are basically different, clinicians should be mindful as there are many occasions where it is difficult to distinguish ASD from OCD, and where these two disorders actually comorbid.
 Exposure/Response Prevention (E/RP) is known as the basic treatment for obsessive symptoms; however, when ASD traits are especially recognized in patient, "conducting outpatient exercise for introducing E/RP," "providing psychoeducation and parenting skills training for parents," "using effective tool for the child patients," and "teaching mindfulness" also become crucial factors to treat OCD patients.
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