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The contact force,the required friction coefficient were tested when people walking on motion platform with different accelerations by gait friction tester,forces acting on the body in different gait phase were analyzed,and the effect of the platform acceleration on mechanical principle of slipping was discussed.The results showed that the peak value of the required coefficient of friction(RCOF1)in landing phase increased with increasing of platform acceleration when people walking on the platform with negative acceleration motion,which was easy to slip; RCOF2 in taking off phase decreased with larger acceleration,and the slipping tendency decreased.The required coefficient of friction could be decreased by adjusting the gait parameters to reduce the possibility of slipping.