To introduce a new modification to simplify the neuroprosthesis of sacral anterior root stimulated micturition for Chinese patients with spinal cord injury (SCI). Spinal cord was transected at T 10 in six dogs and they were randomly divided into 2 groups. In dogs of group I, bilateral L 7 ～S 3 posterior rhizotomy (complete de afferentation, SDAF) was performed. In animals of group II bilateral L 7 , S 2 , S 3 posterior rhizotomy plus bilateral S 1 anterior rhizotomy (partial de afferentation combined with partial de efferentation) were performed. Cystometrogram (CMG) was carried out weekly after the operations. For clinical studies, ten patients with complete SCI above cone were included. Intraoperative electrical stimulation of each individual S 2 ～S 4 roots was carried out and bladder pressure changes were recorded simultaneously. The results showed that the dogs in group II manifested a similar CMG to that of group I, indicating that a flaccid bladder with good compliance and storing function was resulted. For parasympathetic innervation to bladder detrusor in Chinese, it had been found that S 3 root was the most frequent (100%) and the most efficacious (52 2%) contributor, S 4 ranked the second frequent (90%) and a lesser but still significant efficacious (44 9%), and S 2 the least frequent (25%) and the minimal contributor (2 9%). It suggested that using one cable with two electrodes placed on the anterior roots of S 3 and S 4 bilaterally, combined with severance of S 3 and S 4 posterior roots as de afferentation, or plus division of anterior root of S 2 as de efferentation, could restore both voiding and storing function of the bladder in Chinese SCI patients. This new modification has the advantages of reducing the cost of neuroprosthesis and broadening of its indication