The purpose of this study was to investigate the effects and application of emotional freedom techniques and to investigate the applicability of children to children and adults with developmental disabilities. For this purpose, we analyzed the foreign meta - analysis studies of the effect size of the emotional freedom technique(EFT) and the contents of the journals in South Korea. As a result, The effect of the EFT is partly recognized as evidence - based intervention for psychological symptoms and physical symptom due to stress through foreign meta - analytic research, while thirteen intervention studies on EFT In Korea were collected, but there was no meta - analysis. Of these, 70% of the studies (9) were conducted from oriental psychiatry, and 4 studies were conducted for educational and counseling purposes. In addition, as the research method, 77% (10 cases) of the case studies were found among all the studies, and it was found that the research method was needed to be improved. However, the efficacy of EFT was considered to be valid in 84.6% (11 cases), so it can be considered that EFT has therapeutic or educational potential. Although there have been few studies on children and adults with developmental disabilities in Korea and abroad, it has been reported that some overseas cases have been reported to be applicable to the disorder. In the future, RCT research is needed for the scientific validation of the effects of the EFT. Also, as a way to promote the psychological adaptation and development of people with developmental disabilities and their families, A more systematic approach to the potential of EFT is required.