Weak or absent anal reflexes indicate bilateral damage to the pyramidal tract or cauda equina. Damage to the cauda equina is more common in the clinic, mostly due to various congenital or acquired causes resulting in absolute or relative narrowing of the lumbar spinal canal, compression of the cauda equina and a series of neurological dysfunction. Damage to the cauda equina, the anus perineum and lower limbs appear strange sensation, burning pain, and in severe cases, urinary and fecal disorders can occur. It brings great inconvenience to the patients. How should weakened or disappeared anal reflex be prevented and treated? The best treatment is surgery. The principle is early diagnosis, early surgery, emergency surgery if necessary. The purpose of surgery is to release the compression and loosen the adhesion. Sphincter relaxation and revision method: make a half circular incision 3.7-4.0cm in front of the anus, and its concave surface is exactly opposite to the back of the anus. Separate the skin flap to reveal the anterior part of the lower part of the external sphincter skin, and close the two outer edges of the lower part of the external sphincter skin with interrupted sutures, so that the anus can accommodate a finger to the extent. The flap is closed with interrupted sutures, and a rubber sheet is placed under the skin to drain the skin, and a mild pressure bandage is applied. Nerve repair technology is to promote the regeneration and remodeling of destroyed or damaged nerves, rebuild the neuroanatomical projection pathways and loops, regulate and improve nerve signaling, and ultimately realize the repair of nerve function on the basis of the original nerve anatomy and function by adopting various interventional strategies such as physical factor nerve stimulation or modulation, drugs or chemistry. The clinical application of this technology in the Department of Orthopaedics of Beijing 304 Hospital (All-China Orthopaedic Research Institute) has successfully enabled many patients to reduce the plane of injury and greatly improve their quality of life through treatment.