In this study 32 cases of osteoporosis with intertrochanter fracture were divided into two groupsaccording to whether or not an effective stress stimulation applied on the fracture portion afteroperation. Bone cancellous specimens were taken for scanning electron microscopy. Results showed:at two weeks after fracture, the process of callus formation were similar in the two groups; but inthe remodeling stage, in the stress stimulated fracture group, collagen fibers formed well along thelong axis of trafg thin, perforaed and disconnected. The surface of cavity is smooth and few collagenfibers formed. The study indicated that in addition to good relocation and rigid fixation andeffective stress stimulation in the remodeling stage of fracture healing are essential to the treatmentof osteoporotic fracture.