The purpose of this study was to investigate the comparison of blood pressure changes and electrocardiography response at exercise stress testing in hypertension and exercise-induced hypertension(EIH) with middle-aged men. The subjects consisted 39 middle-aged men, who were aged 30~50 years were checked by a body composition and exercise stress testing. The EIH group consisted of 13 persons who had normal blood pressure at rest but, whose systolic blood pressure reached 200mmHg or more, or diastolic blood pressure was 90mmHg or more during exercise testing. The hypertension group included 13 persons who had 140~180/90~110mmHg blood pressure at rest. The control group included 13 persons who showed normal blood pressure during exercise. In measurement index, body composition analysis were measured of percent body fat. The changes of blood pressure at rest and during exercise were measured by exercise stress testing. And exercise stress testing were measured ST segment, ECG interval, and QRS vector. Statistical analysis was performed using analysis of oneway ANOVA. Results of this study were as follows; In the changes of blood pressure, hypertension group and EIH group were higher significantly than that control group in the during exercise 3min, 6min, 9min, and peak. And EIH group were higher significantly than that hypertension group in the during exercise. In the ST segment, hypertension and EIH group were showed higher than that of control group. In the ECG interval, hypertension and EIH group were prolonged significantly than that of control group. And, in cardiac QRS vector, axis of frontal plane were deviated to right side by during exercise high blood pressure, and in amplitude, hypertension and EIH group were showed lower than that of control group. These data suggest that BP and ECG response of hypertension and EIH persons seem to degenerate during exercise high blood pressure. It is promoted that individual proper physical training of EIH persons could be cardiovascular function.