To verify that sertraline combined with fluvoxamine is superior to sertraline combined with aripiprazole

To verify that sertraline combined with fluvoxamine is superior to sertraline combined with aripiprazole, and to observe the indicators of improving patients' cognitive function and adverse drug reactions, so as to provide evidence-based evidence for supplementing the treatment guidelines for obsessive-compulsive disorder

Inclusion Criteria:

• The Diagnostic criteria of OCD in the Diagnostic and Statistical Manual of Mental Disorders 5th edition (DSM-V), as well as the definition of refractory OCD, are as follows: failure to respond to oral treatment with at least two effective doses of antidepressants, including: Fluoxetine (≥20mg/ d), fluvoxamine (≥200mg/d), sertraline (≥150mg/d), and paroxetine (≥ 40mg/d) were all treated for at least 12 weeks. The Yale-Brown compulsive scale (Y-BOCS) score decreased by < 35%.
• The total score of Yale- Brown compulsion scale (Y-BOCS) ≥16 points. (3)age 12 ~ 45 years.

Exclusion Criteria:

• Exclusion of severe organic brain disease;
• Severe physical illness;
• Other mental disorders such as tics, disruptive disorders, eating disorders and autism spectrum disorders;
• Pediatric streptococcal infection causedby autoimmune neuropsychiatric disease (PANDAS);
• Alcohol and drug dependence; Angle-closure glaucoma;
• Suicidal tendencies;
• Previous history of drug allergies related to research;
• Pregnant and lactating women.