Objective To observe the difference of bone micro-structure in different regions of proximal femur, micro-CT scanning was performed on 30 proximal femur specimens to explain the mechanism of proximal femur fracture and to provide anatomical basis for prosthesis design.     Methods Totally 30 intact proximal femur specimens were obtained from 60-80 year-old cadavers. Micro-CT scanning was used to measure the trabecular thickness(Tb.Th), trabecular number(Tb.N), trabecular space(Tb.Sp), connectivity(Conn) and bone mineral density(BMD) and other parameters in 7 regions of proximal femur, including proximal pressure trabecular(PPT), distal pressure trabecular(DPT), femoral head-neck junction(FHNJ), head and neck of femoral neck(HNFN), the base of femoral neck(BPFN), intertrochanteric line(IL) and greater trochanter(GT).    Results The bone mineral density of IL and GT were higher than those of BPFN, FHNJ, DPT and PPT. The trabecular thickness of GT was the largest, followed by IL, BPFN and HNFN, and the smallest was FHNJ, DPT and PPT. The trabecular space of IL was larger than that of GT, and the data of both were larger than those of other parts, among which DPT and PPT were the smallest. The trabecular number of IL and GT were the smallest, BPFN, HNFN and FHNJ were larger, and DPT was the largest. The volume fraction of IL was the smallest, BPFN and HNFN were larger, DPT and PPT were the largest.     Conclusion The bone density, trabecular thickness, bone volume, and total volume of GT and IL in the proximal femur of elderly patients are all relatively large, so the reason for the high incidence of fractures is not due to weak internal bone microstructure; The bone density, trabecular thickness, and trabecular gap at the proximal and distal ends of the vertical trabecular bone are relatively small. If it is necessary to perform core decompression for prosthesis filling at this location, the design should be conducive to the mechanical conduction of the prosthesis and the regeneration of surrounding bone tissue.