Worldwide， the incidence of insomnia disorder is high， which causes serious harm to people's physical and mental health. At present， cognitive behavioral therapy for insomnia （CBT-I） is the preferred treatment method for insomnia disorders， which has the advantages of safety， effectiveness， and long duration of treatment effects. This paper reviews the research status of insomnia disorders， the concept and form of CBT-I， and its clinical application in insomnia disorders， so as to provide reference for clinicians and insomnia patients to choose cognitive behavioral therapy and promote the standardized application and development of CBT-I.