Transverse osteotomy was performed at the middle of each of 52 dog femur.and then fixed pespectively with shape memory sawteeth-arm embracing internal fixator,bone plate and intramedullary nail.The stress shielding rate,bending strength of different directions and torsion strength of the three different fixation methods were measured and compared.The embracing force of the embracing fixtor was found to be high enough,so that the bending force between the embracing fixatorgroup and bone plate group showed no significant difference.But thestress shielding rate of the embracing fixation group was much lower than that of the bone plate group(p<0.01).While the torsion strength of the embracing fixator group was significantly higher than that of intramedullary nail group(p<0.01),The results showed that the embracing fixtor to provide reliable fracture fixation, and prevent osteoporosis caused by stress shielding of bone plate.The embracing fixator also has a good property in the resistance to torsion which is less than that in case of intramedullary nailing fixation, and does not induce further damage to the intramedullary circulation.