The lumbar brace is only applied in the acute phase and is not advocated for patients with chronic painful low back pain. Low back pain is very common in life, and some patients present with acute low back pain, i.e., strong, intense low back pain that occurs after changing to a certain position, even a small one, and leads to limited lumbar function. This type of low back pain often occurs in relation to the underlying disease of the low back, because there is instability in the patient’s low back before the occurrence of low back pain, there must be muscle and joint problems, and acute lumbar sprain is only the triggering factor. After the occurrence of low back pain, many people will be fixed by the waist circumference, think that after wearing the waist circumference can make the low back pain can be alleviated, also can play a therapeutic role. But in actual use will find long-term wear waist circumference of the people, waist function must be bad. The reason is that after long-term fixation of the waist, the muscle function of the waist will decline, and even deep muscle atrophy will occur. Therefore, in clinical practice, it is only recommended that patients with acute low back pain wear a waist brace for 2-3 days, usually no more than 3 days. As long as the pain is relieved, the patient is encouraged to remove the waist girth and with moderate functional exercise, which is instead beneficial to the recovery of low back pain. Therefore, lumbar girth is only applied during the acute phase, while it is not advocated for patients with chronic painful low back pain.