Medical Lumbosacral Elastic Fixation Belt” is the result of our research and has also been authorized by the National Patent Office. It has been clinically proven to be effective in instant pain relief for lumbar and leg pain, which is not reachable by general lumbar circumference. A yin and a yang is called the way, B-type fixed belt in the design of the open design scheme, design into the theory of Chinese medicine yin and yang, thin in front and thick in the back, thin for yang, thick for yin, and the person is the abdomen for yin, back for yang, so as to achieve the yin and yang relative, yin and yang rely on each other, yin and yang complement each other; has been tried by patients with acute lumbar sprain, lumbar disc herniation with sacroiliac joint dislocation (subluxation) patients, lumbar spine postoperative spinal stenosis, etc. Because of the significant pain relief effect, the application prospect is good, and I predict that it will soon have the possibility to replace the universal lumbar girth.