For lumbar disc herniation to take traction is effective, traction for such diseases can play a therapeutic role through the following mechanisms: first, in traction can play a role in stabilizing the lumbar spine, because through traction can make the patient’s waist remain completely fixed, it can prevent the nerve root related stimulation due to the activity of the waist. Second, traction can effectively relieve the muscle spasm of the lumbar region, when the onset of lumbar disc herniation, the lumbar muscles will produce spasm and then lead to lumbar pain, then through traction can effectively relieve the lesion and then relieve the symptoms. Third, traction can reduce the compression of the nerve roots, in the process of traction between the lumbar vertebrae will have a certain degree of expansion of the intervertebral space, will make a certain degree of retraction of the disc, in addition, the nerve roots may also be stretched, and then avoid the protruding parts, through this series of mechanisms, can relieve the compression of the nerve roots.