Yoga is one of the most popular exercises employed by people for relaxation, pressure reduction and health preservation. However, the application and the effectiveness of it in clinical psychiatry have not been studied or discussed. The aim of this study is to exam the effectiveness of applying yoga exercise to different phases of the psychiatric patients. 15 hospitalized psychiatric patients from a medical center (5 males, 10 females, age average: 35; SD=8.59 years) attend a 60-minute long yoga exercise daily for two weeks. In addition, 19 psychiatric patients from the day-time rehabilitation center (7 males, 12 females, age average: 38; SD=12.01 years) attend a 60-minute long yoga exercise five days a week for four weeks. Every patient attends the focus group discussion and completes the integrated occupational therapy evaluation in his/her first and the last yoga lesson in order to understand the effectiveness of the lesson. The study result indicates that a conspicuous improvement on sleep quality, depression, anxiety, and hopelessness for patients with acute/chronic psychiatric disorder through the customized yoga content and group sharing activity specifically designed by the occupational therapists in reducing problems related to emotional pressure. The result also shows that patients' motivation for participation and their willingness to participate enhance greatly. It is expected that the result can be used as an alternative treatment option for psychiatric occupation therapy. Yoga exercise can not only infuse the patient with his/her life but also serve as a technique for enhancing daily living quality and adjusting emotions.