Purpose: This study was a descriptive research to investigate the impact for middle aged women of health perception, self-efficacy, family support on Yangsaeng, a traditional Oriental way of promoting health. Method: Data were collected through questionnaires from 277 middle aged women. Collected data were analyzed using PASW Statistics 18. Analysis included descriptive statistics, t-test, ANOVA, Pearson correlation coefficient and stepwise multiple regression. Results: There was a statistically significant difference in Yangsaeng according to average monthly household income. There was a significant positive correlation between Yangsaeng and self-efficacy, family support, and health perception. Health perception, family support, self-efficacy, and monthly income were found to be significant predictors (36%) of Yangsaeng. Conclusion: To promote Yangsaeng in middle aged women, nurses should focus on factors identified in this study when developing nursing interventions for health promotion.