To study gait parameters of young people's walking with normal speed,provide basis to de- sign artificial limb and make the gait evaluation,5 normal young people with approximate age,stature and body weight were taken as experimental objects in investigation.VICON movement analysis sys- tem was used to test people's gait under the condition of normal walking speed.The basic gait parame- ters and the statistical curve of joint angles were obtained.The angles on single support condition were analyzed and the differences between left and right joint angles were compared.The differences togeth- er with the phase symmetry index will evaluate the symmetry of gait more reasonably.The result is of reference to the design of prosthesis and simulation of normal people's gait.