<正> Objective:To evaluate the effect of encircled fixer of shape memory alloy on bone fracture. Meth-ods:A total of twenty patients with eighteen males and two females was studied. There were three patients withfractares in the upper one third of thighbone, five with fractures in the middle part of thighbone, six with humeralfractures, three with collarbone fractures,one with ulna fracture and two with thighbone fractures as complication ofartificial hipbone arthroplasty. After exposure and fixation of fracture ends, prepared encircled fixer was inserted in-