The purpose of this study was to identify the degree of self efficacy, self regulation, situational barriers and self care behavior in patients with diabetes and to identify the relationships among those variables. Ninety five non insulin dependent diabetic patients participated. Data were collected by a self report questionnaire. The results are as follows 1) Mean scores for self care behavior were 4.64 (diet) and 6.60(medication) on a 7 point scale. 2) Mean scores for self efficacy were 65.12(diet) and 88.46 (medication) on a 100 point scale. 3) Mean score for self regulation was 0.42 on a 0-1 point scale. 4) Mean score for situational barriers was 1.48 on a 4 point scale. 5) Self efficacy was significantly highly correlated with self care behavior (r=0.72, P<0.01). 6) Self regulation(r=0.28, P<0.01), situational barriers(r=-0.32, P<0.01) were significantly correlated with self care behavior. 7) Self efficacy was significantly correlated with self regulation(r=0.25, P<0.01), situational barriers(r=-0.22, P<0.05). These results suggest that for improvement in self care behavior nurses should increase the level of self efficacy and self regulation in patients with diabetes and help these patients to cope with situational barriers.