Objective To evaluate the Biomechanical characteristics of the SSRF in the treatment of lumbar spondylolisthesis.Methods Five fresh cadaver specimens were used in the studies. The spinal intensity ,stiffness and stability by using experiment mechanics analysis methods after SSRF interfixation in the treatment of lumbar spondylolisthesis contrast with those after Steffee steel plate interfixation ,MSF interfixation and SF interfixation. Results The spinal average intensity and stiffness after SSRF interfixation in the treatment of lumbar spondylolisthesis is higher than those of normol specimens and those after Steffee steel plate interfixation ,MSF interfixation and SF interfixation. The spinal ultimate stength after SSRF interfixation in the treatment of lumbar spondylolisthesis is higher than those after Steffee steel plate interfixation ,MSF interfixation and SF interfixation.Conclusion The biomechanical characteristics of SSRF device are superior to those of Steffee steel plate ,MSF interfixator and SF interfixator. It is effective and safe for the treatment of lumbar spondylolisthesis .