Purpose: This study was conducted to investigate the effects of self-efficacy promoting program on self-efficacy, self-care behavior and psychosocial adaptation in patients with a colostomy. Method: A non-equivalent control group pre test post test design was used. The self efficacy promoting programs was composed of a CD image program based on varicaious experience, education and telephone coaching program based on verbal persuasion, and Stoma care practice, and Self care performance based on performance accomplishment. This study was carried out from July 2, 2005 to April 20, 2006 and 21 patients with a colostomy at one of 2 hospitals participated. Descriptive statistics, ${chi}^2-test$, and Mann-whitney U test were used to analyze the data. Results: There were significantly different for specific self efficacy, self care and psychosocial adaptation between the experimental group and control group. Conclusion: The self efficacy promoting program for patients with stomas was effective in improving degree of specific self efficacy, self care and psychosocial adaptation.