Object To evaluate the biomechanics of several groups of femoral prothesis stems matched with a femur,and get a stem which mechanics distribution nearly to normal femur from these stems. Methods The image files withbmp format of the proximal femur X ray and four groups femur- prothesis templat matched with the femur were introduced,and the bi-dimension contour data of femur and femur matched with the template were extracted respectively ,we madeuse of the sofe of ANSYS to establish the model of geometrical and bi-dimesion nonlierarity Finite Element including femurand femur-femoral stem, the condition of stress distribution in proximal femur was analysised and compared by loading.Results After the stem was inset, the stress distribution and value in proximal femur were different from normalfemurobviously, but in four groups stems ,there was a stem which stress distribution and value in proximal femur nearlyto normal femur at last and the stem’s biomechanics property was superior to the others’ in the femur. Conclusion Byanalying and comparing the biomechanics of the femoral prothesis based on X-ray and template, the property ofbiomechanics of femoral prothesis has been evaluated to offer basis for super-selection prothesis.