BACKGROUND: Non-drug therapy is a common clinical treatment for chronic insomnia, and the effect of happiness perception training group based on five senses therapy on chronic insomnia has not been evaluated. OBJECTIVE: This study investigated the effects of happy sensation training group on anxiety, depression and insomnia symptoms in patients with chronic insomnia disorder. METHODS: A prospective, assessor-blind, randomized controlled design was used. Adult patients with chronic insomnia were recruited from the Sleep Medicine Center of Sichuan Provincial Center for Mental Health. Participants in the training group received 10 sessions of hospital-based happy sensation training group therapy and three months of home exercises. The control group received health instruction. Results included anxiety, depression, and insomnia and were assessed at baseline, 2-week intervention, and 3-month follow-up. Polysomnography was performed at baseline and 2-week intervention. Two-way repeated measure ANOVA and Nonparametric test were used for data analysis. RESULTS: 42 patients in the training group and 43 patients in the control group accomplished 3-month follow-up. There was no significant difference in anxiety, depression, insomnia and sleep Characteristics between training group and control group at baseline ( CONCLUSION: Happiness sensation training group can effectively improve the anxiety and depression of chronic insomnia patients, so as to improve insomnia. Given its acceptability and practicality, the program could be incorporated into routine treatment. CLINICAL TRIAL REGISTRATION: https://www.chictr.org.cn/bin/project/edit?pid=210919, identifier ChiCTR2400082199.