To maintain the lean body mass and avoid the dramatic decline of basal metabolic rate become the major factors to successfully control weight. The research aimed to analyze the effectiveness of weight training intervention on weight losing plan. Twenty seven male college male students in weight control class served as the subjects and all of them were educated with diet control related knowledge. Besides, group A (n=13, BMI:29.45) received four times of aerobic exercises and weight training weekly for three months ; On the other hand, group B (n=14, BMI:29.85) underwent four times of aerobic exercises in one week for three months as well, but without weight training involved. The results were as followed: On both groups, the weight (A:-4.77kg, B:-5.27kg), BMI (A:-2.37, B:-2.54), and body fat (A:-3.27%, B:-4.45%) decreased tremendously. Regarding the lean body mass, the skeletal mass (A:+0.68kg, B:-1.11kg) showed decrease in group b and reached statistical significance (p<.05). On the metabolic rate, group A's metabolic rate of post test went up and was greater than that of group B (p<.05). The research revealed that aerobic exercise (with or without weight training) helped people to lose weight effectively; On the other hand, adding the intervention of weight training in aerobic exercise effectively maintained lean body mass and increased the basal metabolic rate comparing with aerobic exercise alone.