Objective． An internal fixation apparatus—— distraction reduction fixation system（DRFS） was designed to satisfy the clinical needs for spondylolisthesis. Methods. Since 1996

53 patients were treated with DRFS. Among them

35 had spondylolisthesis

12 had lumbar canal stenosis accompanied with instability

2 had vertebral tumors and 4 suffered from spinal fracture. The average age was 53.6 years old （ranged 24～ 72yrs）. The mean time for follow- up was 30.6 months （16～ 44 months）. Results． The slip rate was 0.15± 0.10 before operation

and decreased to 0.09± 0.07 after operation. Entire slip reposition was achieved in 19 cases （54.3％ ）. The change in height of the intervertebral space within the fixation segments was 0.7± 0.17. Conclusion． DRFS achieved better results for spondylolisthesis less II degree and no other adverse effects were found. Compared with other foreign and domestic techniques

it had advantages in less implants

less operation gears required and ease to utilize in operation. It was proved to be an ideal internal fixation apparatus.