Purpose: We analyzed the self-care behavior and metabolic control rates in diabetic patients based on the National Health and Nutrition Examination Survey in Korea (2005). Methods: The study group included 311 patients who were over 126 mg/dL on the FBS test. Data were analyzed using SPSS PC WIN 12.0. Results: The average score of self-care behavior was $12.08{pm}1.05$ points, and significantly different according to DM treatment status, disease duration (years), admission experiences (within 1 year) and education about DM. Glucose, total cholesterol, triglycerides were decreased in self care subjects, but not significantly. Conclusion: An educational program for diabetic patients would help maintain metabolic control rates to improve self-care behavior.