Lumbar interspinous process spacer, as a important aspect of dynamic stabilization system,through implant a spacer into interspinous process, which can limit the extension of the pathological segment, reserves the physiological activities basically, increases the volume of the spinal canal and intervertebral foramina, decreases the loading of the posterior of disc, and it doesn't affect the motion and the loading of the adjacent segment significantly. From the available documentary, the biomechanical and clinical results of various lumbar interspinous process spacers were optimistically. The purpose of this paper is to review these investigations in respect of lumbar interspinous process spacers.