The purpose of this study is to investigate the safety and effectiveness of moderate intensity exercise training on hypertensive patients. Subjects were recruited from hypertensive clinic, 10 in exercise group and 10 in comparison group. The exercise group conducted 50%~85% HRmaxRev exercise for 60 minutes twice a week for three months. Before and after the 3-month interval, each subject received treadmill test and serum lipids evaluation. During exercise, the blood pressures of the subjects were taken every 5~10 minutes. The results were as following. The intensity of exercise at level of 50%~85% HRmaxRev is about 55+13% of VO2max and is about 5.5+1.1 MET. Blood pressure increased during exercise, especially in the first 10-minutes of warm-up period. The highest blood pressure developed in the first month and then lowered down in the following months. The total calories consumed were above 300Kcal at 50%~85% HRmaxRev exercise for 60 minutes. Before and after the 3-month interval, subjects in both groups had no significant change in body weight and serum lipids levels. Subjects in exercise group had significant reduction of resting heart rate (3.7 bpm), SBP (17.5 mmHg) and DBP (8.8 mmHg), with insignificant increase in VO2max . Subjects in the comparison group did not have any significant change in body weight, serum lipids levels, resting heart rate, and blood pressure. The VO2max decreased 10% significantly (p＜0.05). This study demonstrated that moderate intensity exercise was effective for reducing blood pressure and preserving cardiopulmonary fitness for hypertensive patients. For safety, patients need to be supervised for blood pressure change in the beginning stage, especially during their warming-up process.