There were many methods to treat spondylolisthesis since the past but completely satisfiable method was not developed until now. Recently, many spinal instruments were introduced and used worldwidely to treat spondylolisthesis. The author reports the experience of nine patients of transpedicular screw instrumentation of obtain reduction and fixation of the spondylolisthesis. Follow-up period was between 7 to 33 months after operation with average 19 months. The result was as follows: The age of the patients was 46 years in average ranging from 29 to 61 years. 2) Types of spondylolisthesis were isthmic type in 6 cases and degenerative type in 3 cases. The level of lesion were L4-5 in 5 cases. L5-S1 in 3 cases and L3-4 in 1 case. 3) Preoperative clinical feature include low back pain(100%), sensory disturbance(78%), radiating pain(67%), neurologic claudication(56%). 4) The amount of displacement measured by Boxall was 22.6% preoperatively to 7.3% postoperatively and the amount of angle by Meschan was from 12.7 degree preoperatively to 4 degree postoperatively. 5) Postoperative complications were urinary tract infection(3 cases), screw loosening(1 case), superficial wound infection(1 case), deep wound infection(1 case), and meralgia paresthetica(1 case). 6) The overall result was satisfactory except 1 case due to screw loosening, and satisfiable bony fusion was obtained except 1 case.