In addition to reliable fixation, the treatment of long bone shaft fracture requires effective resistance to the stress of bending, shearing and torsion while retaining certain stress from longitudinal compression so as to stimulate fracture healing and bone remodeling. The shape memory sawlooth-arm embracing fixator (SSEF) could provide a selective stress shielding effect and fulfilled the above requirement. A series of studies showed that the bending and torsional strength in the fixation of fracture of SSEF was similar to that of the stainless steel bone plate (SSBP) while its compressive stress shielding rate is markedly lower than SSBP (P<0.01). The appearance of osteocytes entered into degenerative phase in the SSBP group was earlier and more vigorous than that in the SSEF group. The segmental bone loss caused by stress shielding effect of the SSEF group was significantly less than that of SSBP group (p<0.05-0.01). In conclusion, the SSEF provides reliable fracture fixation and axial compression stress which is beneficial for enhancing fracture healing and reduce segmental osteoporosis caused by stress shielding effect.