The author has extensive clinical experience in the treatment of refractory obsessive‒compulsive disorder（OCD）. There appear to be numerous clinical factors affecting the treatment responses of OCD patients, but the cognitive‒behavior features of these patients could also be contributory. In this article, the author reports a man with OCD who had cognitive‒behavioral features affecting the severity of OCD. There was no definitive diagnosis of developmental disorder. However, approaches to cognitive‒behavioral features were effective. It became much easier for the patient to suppress his compulsions.
 The author speculates that approaches to cognitive‒behavioral features are both important and useful for the treatment of patients with OCD regardless of whether or not developmental disorders are present.