Cognitive behavioral therapy is considered the most effective psychotherapy for OCD and consists mainly of thought blocking and exposure response prevention. Thought blocking is used to block obsessive-compulsive thoughts by diverting attention or exerting external control, such as setting alarm bells, when they occur repeatedly, along with relaxation training to relieve anxiety when necessary. For example, if the patient is afraid of getting dirty and must wash his hands repeatedly to make sure he does not get sick, he needs to gradually touch his sweat, the soles of his shoes, the door handles of public toilets, and toilet seats without washing his hands in several sessions during the exposure prevention. The anxiety that accompanies obsessive-compulsive symptoms will be relieved after several treatments until it subsides, thus achieving the effect of controlling obsessive-compulsive symptoms.