Establishing an human spine dynamic model is an significan event to study spine injured biomechanics of pilot's ejective injury,parachute opening,landing and study the endurance to impact loading on human spine.In this paper,the Huston's method of Kane's equations is developed so that it can be applied to the multi body system including translation between the bodies.The dynamic model of human spine is provided basing on these theories,while the big movement of spine is considered.The deformation of vetebra...