Lumbar disc protrusion (LDH) is a major disease causing low back and leg pain, which seriously affects people’s normal work and life, but due to the anatomical and physiological complexity of the lumbar disc, there have been many debates on the pathogenesis, diagnosis and treatment of lumbar protrusion for a long time. The present study explored the relationship between the straight-leg raise test (SLR) and the degree of herniation, disc degeneration, and clinical typing, and reported as follows Although the more severe the herniation, the higher the rate of positive straight leg raise test, there were still 30 negative straight leg raise tests, 30% incidence of disc bulge, 33.3% incidence of herniation, and 36.3% incidence of prolapse, and similar reports from abroad, Jensenl and Stadnik et al. Beanie et al. showed that the incidence of disc bulge was 52% and 81% in the two groups, and the incidence of protrusion was 27% and 33%, respectively; the incidence of disc prolapse was 1% in the Jensen group and none in the Stadnik group; Beanie et al. also pointed out that disc bulge was not related to specific forms of pain, indicating that LDH is the main cause of low back pain, but not all of LDH produce the corresponding symptoms and signs; due to the compensatory capacity of the body and the role of cushioning structures (fatty spaces in the spinal canal, venous plexus, cerebrospinal fluid, etc.), there can be no corresponding symptoms or radicular signs if the herniation is small or if the inflammatory and immune response does not reach the nerve roots. The degree of degeneration is not related to the rate of positive straight leg raise test. Relevant studies have shown that in lumbar disc degeneration, due to changes in its biochemical composition. That is, a decrease in water and proteoglycan and an increase in collagen content cause a decrease in its T2 belief number and are considered a sign of disc degeneration, Beanie et al. state that disc degeneration is not associated with a specific form of pain, which is consistent with this study, and in contrast to this study Terlli et al. suggest that the degree of degeneration is associated with low back and leg pain, and there is currently much debate about the “black disc There is still much debate about the meaning of “black disc” and further research is needed on the issue. Straight leg raise test was not correlated with lumbar pattern. Feng Tianyou believes that the mechanism of body shape change during the development of lumbar synostosis is that the spinal-pelvic conjugate system is a mechanical equilibrium. When the intervertebral mechanical balance of the spine is disturbed and destabilized, the body will use self-stabilizing mechanisms such as pelvic tilt, scoliosis, and thoracic torsion for self-regulation, and the anterior convexity of the lower back curve in the sagittal position is forced to compensate for the coronal rotational scoliosis, and a new state of force balance is established, and due to pain avoidance Reflexes and the requirement to walk upright lead to changes in overall body shape. The change of waist shape can reflect the development stage of the disease more comprehensively, and judge the severity of the disease and the disease situation, while the straight leg raise can only explain one side of the disease, so we must consider the waist shape and other comprehensive factors to judge the disease. In summary, the straight leg elevation test has an important role in the diagnosis and treatment of lumbar disc herniation, but it does not fully cover the entire situation, and the clinical significance of the straight leg elevation test should be reunderstood. The straight leg elevation test can, to a certain extent, indicate the degree of lumbar disc herniation and degeneration, but it does not fully cover all cases. Due to the many causes of lumbar pain and the strong compensatory capacity of the body, there are still some patients with obvious herniation but no radicular signs, and the straight leg elevation test does not reflect the stage of development of the disease, so we are prompted to consider comprehensive factors to judge the disease.