The purpose of this study is to identify the prevalence of dementia, improve the quality of life and prevent the progression of severe dementia through early detection of dementia of the elderly inmates over 60 years old in K prison located in Gyeongbuk. Dementia screening test (Mini-mental State Examination) was performed and depression and self-esteem were measured with targets of all elderly inmates over 60 years. Upon examination, it was checked whether they wanted to participate in the program. After the test results came out, it was checked again whether they wanted to participate in the program. “Cognitive enhancement program” was performed with targets of 18 volunteers among those who had cognitive impairment. After program, satisfaction test was additionally performed in addition to all tests performed prior to the program. Upon comparison of pre- and post-tests, cognitive score in dementia screening test was improved and depression score was lowered. It seemed effective, but there was no change in self-esteem. However, as participation of the elderly inmates was high, it contributed to improve the quality of life of the elderly inmates.