Abstract: A nonlinear three-dimensional finite element model of human spine was used to investigate the biomechanical characteristics of injured spine in vibratory environment. The injury status of the spine includes the denucleation of intervertebral discs and facetectomy, and the influences of different frequencies and damping on the dynamic characteristics of human spine were also taken into account in simulation. The analytical results indicated that, under whole body vibration, the lumbar spine exhibits not only the vertical vibration but also the flexion-extension motion with small amplitude. The denucleation and degeneration of intervertebral discs might increase the facet contact force and it is quite disadvantage to the facet joints under vibration conditions. Moreover, the influence of vibration on the facet joints of lumbar spine is higher than other regions at the same motion segment.