Abstract:Internet-based cognitive behavioral therapy( ICBT) is a psychotherapy that evolved from cognitive behavioral therapy( CBT). ICBT can improve the availability and acceptability of CBT for mental disorders and other clinical problems, effectively reducing medical and social costs and increasing the costeffectiveness of treatment. This review will introduce the concept, advantages, limitations and theories of ICBT and then systematically review the efficacy and cost-effectiveness of ICBT in the treatment of obsessive compulsive disorder( OCD) in the past decade, so as to provide reference for the study of ICBT in the treatment of OCD.