The purpose of this study is to provide basic information for improving medical security between the Korean National Health Insurance Corporation and the private health insurance in Pusan Metropolitan area by investigating of the recognition with the benefit groups. Questionnaires of 431 were taken between Feb. 11th and Feb. 25th 2008. The survey was carried out to gather information about SES and contents of insurance and recognition between the benefit group of the Korean National Health Insurance and the private health insurance on the financial conditions and the stability. The result of survey is as follows. First, there is a difference between the National Health Insurance and the private health insurance on the financial conditions and the stability of the Korean National Health Insurance. Second, there is a high score at the private health insurance on the financial conditions and the stability of the private health insurance. Third, privatizing of a National Health Insurance is high score at increase of the premium, medical payments of the National Health Insurance group and is high score at enhance of quality of medical service and decrease of loss of medical payment of the private health insurance group. Therefore, to provides more information and improved medical security with the benefit group. it is necessary for concerns to put more efforts in creating Conflicting vs. Complementing of systemic base.