The purpose of this study was to analyze the socio-economic factors, the factors affecting the private insurance, utilizing Korea National Health & Nutrition Examination Survey 2011. Findings of the study can be summarized as follows. First, participants with private insurance are young, high monthly income, low prevalence of chronic illness. Second, participants with private insurance and chronic illness were young and high monthly income. Third, Average monthly household income, the higher the age is younger. Private insurance and national health insurance was higher subscription rate. Consequently, participants with private insurance and uninsured of the major differences is the age and the average monthly income. Elderly, low income are needed health promotion and disease prevention for expanded medicare, welfare policies.