The purpose of this study was to analyze the changes of the muscle strength and length according to the changes of evaluation postures. Subjects of this study were 13 male and 13 female students. 6 evaluation postures were selected for this study(K90H90, K90H45, K90H0, K70H90, K70H45, K70H0 ; K90=knee $90^{circ}$ flexion, K70=knee $70^{circ}$ flexion, H90=hip $90^{circ}$ fleion, H45=hip $45circ}$ flexion. H0=hip $0^{circ}$ ). The peak torque and hamstring muscle length(from fibula head to ischial tuberosity) were measured at each postures. The peak torque level was evaluated by make use of the KIN-COM. The results were as follows : 1. The peak torque in male was significantly increased with changes of hip flexion angle but not in female(($90^{circ};>;45^{circ};>0^{circ}$). 2. The hamstring length and peat torque in male and female was significantly changed according to the alteration of evaluation postures.