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Background: The purpose of this study was to compare the effects of knee flexor, extensor muscle strength distribution in squat exercise of two forms. Method: Participants were 24 students (males 12, females 12) who don’t have knee joint disorder. We had divided them into 2 groups(45〫 squat group, 90〫 squat group) and we measured peak torque of knee flexor, extensor muscle at 60°/sec angular velocity. Result: Left knee flexor Peak Torque among the two groups was significantly different after exercise(p<.05). Right knee extensor Peak Torque among the two groups was significantly different after exercise(p<.05). Conclusion: Based on these results, muscle strength of the knee joint was significantly increased semi-squat on left flexor and right extensor. Therefore, this result purposes wall slide squat to increase muscle strength of the knee joint, and It was considered positive impact that semi-squat exercie.