- OCD patients： Among 18 to 54 years old, males or females； See a doctor because of OCD recently，conform to DSM-Ⅳ(Diagnostic and Statistical Manual of Mental Disorders) diagnostic criteria of OCD; The scores of the Yale-Brown Obsessive-Compulsive Scale (Y-BOCS) is not less than 16 points; Has not yet accepted psychiatric medication or have received irregular medication treatments and discontinuation for at least eight weeks; A junior high school and above level of education; Has enough of seeing and hearing level to complete the necessary checks; Right-handed (this standard is limited to magnetic resonance imaging (MRI) detection); The Han nationality (this standard is limited to genetic testing); Willing to participate in this study..