Objective To study the mechanical properties of the new micro-movement elastic implant of distal tibiofibular syndesmosis in dorsiflexion position. Methods A combination of simulation and experiment has been used. Mimics and the CT data have been used to establish a normal ankle dorsiflexion model, a bone nail repaired model and a micro-movement elastic implant repaired model. Besides, Ansys Workbench has been used for finite element analysis. Instron E10000 has been used to conduct mechanical experiments on the lower limb specimens, and five sets of experimental data have been measured and analyzed. Results The simulation results show that the mechanical properties of the micro-movement elastic implant repaired model is closer to that of the normal ankle dorsiflexion model. But the Von Mises stress of the micro-movement elastic implant repaired mode is greater than that of the bone nail repaired model. The experimental results show that there is no significant difference in the resistance torque between the micro-movement elastic implant repaired mode and the normal ankle dorsiflexion model with two-sample heteroscedasticity T test. Because the P value is 0.99 that is greater than 0.05. other experimental data of he micro-movement elastic implant repaired mode are also better than those of the bone nail repaired model. Conclusion for dorsiflexion position, the repairing mechanical properties of he new micro-movement elastic implant are much better than those of the bone nail. And there is still room to optimize the new micro-movement elastic implant.