To study the neural morphological basis of the "abdominal reflex spinal cord center bladder" artificial bladder reflex arc established by abdominal reflex. It is achieved by intradural microanastomosis of the right T 13 ventral root was anastomosed under microscope to S 2 ventral root by autogenous nerve grafting intraduraly, with the right T 13 dorsal root remaining intact and the right L 5 ～S 4 ventral roots severed. three to four months were allowed to achieve axonal regeneration, and new "abdominal reflex spinal cord center bladder" artificial bladder reflex pathway was established. Eight months after the operation, it was seen under light microscopy that regenerative nerve fibers of ventral root of T 12 had grown through the anastomotic site to distal nerve root. Under electron microscopy, nerve endings in the detrusor of the bladder were seen on the experimental side. The basic structure of the junction between parasympathetic nerve endings and bladder detrusor cells on the experimental side was similar to that on the control side. These features were not seen in the control group. The results suggested that the somatic motor axons above the lumbosacral paraplegia level could innervate bladder parasympathetic ganglion cells, and thereby transfersed somatic reflex activity to the bladder detrusor muscle, which was the morphological basis of the artificial bladder reflex arc leading to controllable micturition