Introduction : The Fourth Korea National Health and Nutrition Examination Survey (KNHANES IV) data revealed considerable prevalence of ischemic heart disease in Korean hypertensive population. The purpose of this study was to clarify the value of life style and nutritional status as risk factors of coronary artery disease from nationwide registry data. Methods : We analyzed 1476 patients (male 44.8%, Age 63.6짹12.1yr) with diagnosed hypertension from KNHANES IV. We checked baseline demographic data and various parameters of life style and nutritional status including socioeconomic status, physical exercise, educational status, social habit, working environment, total calory intake and distribution of each nutrient. Cross sectional analysis was performed to determine risk factors of coronary artery disease in selected patient cohort. Results : Diagnosis of coronary artery disease was confirmed in 83 patients (5.6%). There was no significant difference in socioeconomic status, educational status and total claory intake. In uniivariate analysis, insufficient physical exercise, insufficient sleeping time, stressful working environment and low niacin intake had statistically significant correlation with presence coronary artery disease. After multivariated analysis, stressful working environment (p=0.003, HR=3.088), low niacin intake (p=0.015, HR=2.294) remained independent predictors of coronary artery disease. Conclusion : In addition to classical risk factors for coronary artery disease, stressful working environment and low niacin intake were independent risk factors of coronary artery disease in Korean hypertensive population.