This study aimed to identify the effect of the active aging on life satisfaction and present an improvement strategies to increase life satisfaction in elderly people. Active aging is divide into three aspects; health, participation and security. The subjects were people older than 55 years who were enrolled in Korean Retirement and Income Study. The influencing effect was analyzed by a hierarchial regression. Key factors associated with active aging influencing life satisfaction were subjective health, mental health, participation in the labor market, income, and housing while subjective health was a determinant factor that best describes the effect of the active aging on life satisfaction. On the basis of above result, this study suggests that there needs to be an effort in improvement of physical and mental health, participation in the labor market, and housing at national and regional levels.