The purpose of the present study is to analyze the effect of a training program of reinforcing thign muscle’s strength by exercise of the knee joint, using a guage of synthetic muscle strength, MERAC which is utilized in the field of sports medical science, specially for the revival of the region of the thign, a part which performs a very important function in physical activity, general problems of health, protection of an wound, etc., and to clarify the changes of(quadriceps and hamstrings) after such a training. For the set purpose, some of undergraduate students who do not major in physical education at ‘M‘ university were given a training program of muscle contraction for 12 weeks using; a guage of MERAC. And then, the changes of the quadriceps and hamstrings were compared and analyzed. Conclusions made from such a comparative analytical study are as follows : 1) It appeared that in the effect of the total work in the quadriceps and hamstrings, the isokinetic training group showed more improvement than the isotonic training group and isometric training group(P<.001), and the total exercise amount by various speed appeared bigger in low speed than in high speed(P<.001). And the effect of the total work traning exercise showed a statistically significant difference with regard to a period of such training. 2) It appeared that in the effect of the average power in the quadriceps and hamstrings from the training; from the group having the highest effect, they were the isokinetic training group, isotonic training group, isometric training group, and control group(P<.001), and regarding various speed, the average power was higher in high speed than in low speed(P<.001). And it appeared that the effect of the average power of moment response in the exercise training in the quadriceps and hamstrings showed a statistically significant difference with regard to a period of such training. 3) It appeared that in the effect of the peak torque in the quadriceps and hamstrings from the training; from the group having the highest effect, they were the isokinetic training group, isotonic training group, isometric training group, and control group(P<.05), and the peak torque in various speed showed higher in low speed than in high speed (P<.001). And it appeared that the effect of the peak torque in the quadriceps and hamstrings showed a statistically significant difference with regard to a period of such training.